• Nucleic acids and polynucleotides - class-XII
Back
0

Nucleic acids and polynucleotides - class-XII

Description: nucleic acids and polynucleotides
Number of Questions: 68
Created by:
Tags: nucleic acids and protein synthesis biology molecular biology
Start the Quiz
Attempted 0/68 Correct 0 Score 0
‹
›

Genome is the complete complement of  __________ including all ___________ and the inter genetic regions.

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. DNA and RNA

  2. DNA and genes

  3. RNA and genes

  4. None of these

Show answer
Correct Option: B
Explanation:
A genome is an organism's complete set of DNA, including all of its genes in the genetic regions.
So, the correct option is 'DNA and genes'

DNA is a polymer of a

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. Glucose

  2. Amino acid

  3. Nucleotide

  4. None of the above

Show answer
Correct Option: C
Explanation:

Most DNA molecules consist of two biopolymer strands coiled around each other to form a double helix. The two DNA strands are known as polynucleotides since, they are composed of simpler units called as nucleotides. Each nucleotide is composed of a nitrogen-containing nucleobase either guanine (G), adenine (A), thymine (T), or cytosine (C) as well as a monosaccharide sugar called as deoxyribose and a phosphate group. The nucleotides are joined to one another in a chain by covalent bonds between the sugar of one nucleotide and the phosphate of the next, resulting in an alternating sugar-phosphate backbone. According to base pairing rules (A with T and C with G), hydrogen bonds bind the nitrogenous bases of the two separate polynucleotide strands to make double-stranded DNA. So, nuclotides are building blocks of DNA and not glucose or aminoacid. Thus, the correct answer is option C.

The diameter of DNA molecule is

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. $10 \mathring{A}$

  2. $100 \mathring{A}$

  3. $200 \mathring{A}$

  4. $20 \mathring{A}$

Show answer
Correct Option: D
Explanation:
DNA is made of two ("duplex DNA") dextrogyre (like a screw, right- handed) helical chains or strands ("the double helix"), coiled around an axis to form a double helix of $20 \mathring{A}$ of diameter. The two strands are antiparallel. The general appearance of the polymer shows a periodicity of $3.4 \mathring{A}$, corresponding to the distance between 2 bases, and another one of $34 \mathring{A}$, corresponding to one helix turn.
So, the correct answer is "$20 \mathring{A}$".

As the base sequence present on one strand of DNA decides the base sequence of other strand, this is considered as _____.

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. Descending strand

  2. Leading strand

  3. Lagging strand

  4. Complimentary strand

Show answer
Correct Option: D

A single stranded DNA molecule is the genetic material of bacteriophage

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. T2

  2. T4

  3. 0 x 174

  4. X

Show answer
Correct Option: C
Explanation:

0 x 174 Bacteriophage : In this bacteriophage, DNA is rounded, closed and bangle shaped, the duplication pattern is different type in this bacteriophage.

The basis of life (secret of life) is

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. Lipid

  2. Protein

  3. Nucleic acid

  4. Nucleoprotein

Show answer
Correct Option: C
Explanation:

All the bio-molecules are important for life but as per the question the nucleic acids stand out, because they only have genetic information coded in them and can pass on this information to next generation of cells. So, nucleic acid plays a significant role  in the basis of life. 

UAG is triplet nitrogen base on m RNA. What will be the corresponding triplet on the coding strand?       

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. TAG

  2. UAG

  3. ATC

  4. TUA

Show answer
Correct Option: A
Explanation:
  • In DNA transcription, the coding strand is the DNA strand whose base sequence corresponds to the base sequence of the RNA transcript produced (although with thymine replaced by uracil).
  •  It is this strand which contains codons, while the non-coding strand contains anticodons.
  •  Hence, UAG is triplet nitrogen base on m RNA, TAG will be the corresponding triplet on the coding strand. 
  •  So, the correct answer is 'TAG'.

In eukaryotes basic structural unit made of histone and DNA 

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. Nucleosome

  2. Nucleolus

  3. Chromosome

  4. Lysosome

Show answer
Correct Option: A
Explanation:

In eukaryotes DNA is tightly bound to histones which form a DNA protein particles called nucleosome. Each nucleosome contains 2 copies of each $H _{2A},H _{2B}.H _{3}$ and $H _{4}$ histone protein bounded on 146 BP of DNA.Each nucleosome bead is linked to next nucleosome bead by linker DNA.

The transforming substance in Griffith's experiment is 

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. protein

  2. DNA

  3. mRNA

  4. polysaccharide

Show answer
Correct Option: B
Explanation:

The transforming principle in Griffith's experiment is DNA. Griffith conducted an experiment in 1928. In this experiment he chose two strains of Stephylococcus pneumoniae bacteria. One of them was a smooth strain which was virulent and the other one was a rough strain which was non-virulent. The smooth strains caused pneumonia when they were injected to the mice, and the rough strains did not cause pneumonia in mice. Griffith heat killed the smooth strain bacteria and injected them into mice and he observed that pneumonia was not caused in them. He mixed the heat killed smooth strain and rough strain and injected the mixture into mice and this mixture caused pneumonia in mice. When he tested the blood of the mice, he saw both rough and smooth strains of bacteria. This implied that some factor from the dead smooth bacterial strain had taken entry into the rough strains and converted them into smooth strains. He called this factor as Transforming principle.

Later in 1944 scientists, Avery, MacLeod, and McCarty conducted an experiment to find out what the transforming principle was, They selected DNA, Proteins and RNA. They eliminated proteins by adding proteases and the strains were able to perform the transformation, they eliminated RNA with RNase the strains were still able to perform the transformation, they eliminated DNA with DNase and now the smooth strains lost the ability to transform Rough strains and hence it was proved that the DNA was the transforming principle. 
Therefore the right option is option B, DNA. 

If $H-bonds$ in double stronded $DNA$ is $350$. The ratio of $A$ and $G$ is $4:3$. The total no. of nucleotides and length of $DNA$.

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. $600$ and $1020 A^o$

  2. $700$ and $1190A^o$

  3. $800$ and $ 1700 A^o$

  4. $750$ and $680 A^o$

Show answer
Correct Option: A

In which stage the DNA is doubled?

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. Metaphase

  2. Anaphase

  3. Interphase

  4. Prophase

Show answer
Correct Option: A

In double helix of DNA, the two DNA strands are?

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. Coiled around a common axis

  2. Coiled around each other

  3. Coiled differently

  4. Coiled over protein sheath

Show answer
Correct Option: A

The two strands of DNA are?

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. Similar in nature and complementary

  2. Anti parallel and complementary

  3. Parallel and complementary

  4. Basically different in nature

Show answer
Correct Option: A

Suppose two species A and B share 94% of their DNA with each other and species C shares 75% of DNA sequence with and B. What inference can be drawn from it ?

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. Species A and B share more recent common ancestor with each other than either shares with C.

  2. Species C evolved more recently than species A and B.

  3. Species C is more closely related to species B than to species A.

  4. Species A and B have common ancestor but neither have common ancestor with species C.

Show answer
Correct Option: A

In a given $100$ bp DNA segment the number of nucleotide of guanine is $20$. The total number of hydrogen bonds stabilizing this double helix are?

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. $130$

  2. $120$

  3. $220$

  4. $300$

Show answer
Correct Option: A

On which strand of DNA, m-RNA is constructed?

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. Trand oriented as $5' \rightarrow 3'$

  2. Strand oriented as $3' \rightarrow 5'$

  3. Both the strands

  4. Any one strand

Show answer
Correct Option: A

ADP ATP ADP system was found by Lipmann in

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. 1940

  2. 1950

  3. 1960

  4. 1970

Show answer
Correct Option: A

In polypeptide synthesis, amino acids are brought over ribosome-mRNA complex by

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. rRNA

  2. tRNA

  3. DNA

  4. Nucleotides

Show answer
Correct Option: B

Anticodon is made of

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. Three adjacent nitrogen bases

  2. Unpaired triplet bases on mRNA

  3. Paired triplet of nitrogen bases on tRNA

  4. Unpaired triplet of nitrogen bases at one end of tRNA

Show answer
Correct Option: D

Which is correct for ADP?

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. Two high energy bonds

  2. One high energy bond

  3. Three high energy bonds

  4. None of the above

Show answer
Correct Option: B

Molecule of ATP is structurally similar to the molecule of

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. DNA

  2. RNA

  3. protein

  4. AMP

Show answer
Correct Option: B

Enzyme required during DNA replication is

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. DNA polymerase

  2. DNA ligase

  3. Both A and B

  4. Sigma factor

Show answer
Correct Option: C

Length of one coil of B-DNA helix is 

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. 0.34 nm

  2. 3.4 nm

  3. 10nm

  4. 20nm

Show answer
Correct Option: B

Double stranded DNA virus with 20,000 base pairs has nucleotides

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. 20,000

  2. 10,000

  3. 666

  4. 40,000

Show answer
Correct Option: D

Hargobind Khorana is known for

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. Discovery of DNA

  2. Discovery of DNA ligase

  3. Discovery of tRNA

  4. Synthesis of proteins

Show answer
Correct Option: B

Coded information in nucleic acid depends upon

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. Arrangement of nucleotides

  2. Position of nucleotides

  3. Number of nucleotides

  4. All the above

Show answer
Correct Option: A

Special unwinding enzyme that breaks hydrogen bonds between the two strands of DNA is

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. Primase

  2. Topoisomerase

  3. DNA polymerase

  4. Helicase

  5. DNA ligase

Show answer
Correct Option: D

Nucleotide pairs present in one turn of DNA helix

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. 4

  2. 8

  3. 10

  4. 9

Show answer
Correct Option: C

Select correct/incorrect functions
1.Ligase - joins short DNA segments
2.DNA Polymerase - Cuts DNA at specific sites
3.Helicase-Breaks H-bonds between complementary DNA strands

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. 1, 2 and 3 correct

  2. 1 correct, 2 and 3 false

  3. 1 and 3 correct, 2 false

  4. 1 and 2 correct, 3 false

Show answer
Correct Option: C

The codon for anticodon 3' UUUA-5' is

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. 5' AAAU-3'

  2. 5' UAAA-3

  3. 3 UAAD-5

  4. 3' AAAU-5

Show answer
Correct Option: A

DNA duplex shows

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. Right handed coiling and parallel

  2. Right handed coiling and antiparallel

  3. Left handed coiling and antiparallel

  4. Left handed coiling and parallel

Show answer
Correct Option: B

DNA strands have

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. Quaternary structure

  2. Same polarity

  3. Antiparallel polarity

  4. Disulphide bond

Show answer
Correct Option: C

Chargaffs rules are applicable to

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. Single stranded RNA

  2. Single stranded DNA and RNA

  3. Single stranded DNA

  4. Double stranded DNA

Show answer
Correct Option: D

DNA contains nucleobases, sugar and phosphate. Removal of which among these will not affect length of DNA

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. Nucleobases

  2. Phosphate

  3. Sugar

  4. None of the above

Show answer
Correct Option: A

DNA double helix is

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. Complementary and parallel

  2. Complementary and antiparallel

  3. Without super coils

  4. Always circular

Show answer
Correct Option: B

Which is an example of highly repetitive DNA?

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. Alu elements

  2. Histone gene cluster

  3. Dispersed repetitive DNA

  4. DNA minisatellite

Show answer
Correct Option: D

What is not relevant to DNA double helix ?

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. One turn every 34

  2. Diameter 20

  3. Distance between adjacent nucleotides 3.4

  4. Back bone has alternate ribose sugar and phosphate

  5. Sugar molecules are joined by phosphodiester bonds

Show answer
Correct Option: D

Diameter of DNA double helix is

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. 34 A

  2. 20 A

  3. 3.4 A

  4. 340 A

Show answer
Correct Option: B

Single base DNA differences are called

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. VNTR

  2. SSCP

  3. SNP

  4. Expressed sequence tags

  5. Repetitive

Show answer
Correct Option: C

1.7 m double helical DNA will have base pairs

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. 3.4 x $10^9$

  2. 5 x $10^9$

  3. 1.7 x $10^9$

  4. 1.7 x $10^5$

Show answer
Correct Option: B

Crick, one of the discoverer of DNA double helix was man of

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. Botany

  2. Physics

  3. Chemistry

  4. Zoology

Show answer
Correct Option: B

In double helix model of DNA, how far is each base pair from the next base pair

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. 3.4 nm

  2. 0.34 nm

  3. 2.0 nm

  4. 34 nm

  5. 0.034 nm

Show answer
Correct Option: B

The pitch angle of deflection between two successive base pairs in DNA double helix is

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. $20^0$

  2. $34^0$

  3. $36^0$

  4. $360^0$

Show answer
Correct Option: C

Which of the following is correctly matched

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. UAC-Tyrosine

  2. UCG-Start

  3. UUU-Stop

  4. UGULeucine

Show answer
Correct Option: A

Initiation of DNA strand synthesis is performed by

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. DNA polymerase I

  2. DNA helicase

  3. DNA primase

  4. DNA topoisomerase

Show answer
Correct Option: C

Which of the following pairs are correctly matched

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. Adenine-Thymine

  2. Thymine-Uracil

  3. Uracil-Cytosine

  4. Guanine-Adenine

Show answer
Correct Option: A

A DNA double helix is 340 nm long. Number of nucleotides found in it is

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. 20

  2. 200

  3. 1000

  4. 2000

Show answer
Correct Option: D

In double helix of DNA, there are sugar phosphate backbones with bases projected

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. Outwardly

  2. Outwardly and inwardly

  3. Inwardly

  4. Interpolated

Show answer
Correct Option: C

The enzyme which helps to cut one strand of DNA duplex to release tension of coiling of two strands is

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. DNA ligase

  2. DNA polymerase I

  3. Topoisomerase

  4. Helicase

Show answer
Correct Option: C

TACAAAGGGTTTCAACCC is the sequence of nucleotides in a DNA strand. Predict the sequence of amino acids found in a protein formed from it

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. Proline, phenylalanine, lysine, methionine, glycine, valine

  2. Methionine, phenylalanine, glycine, valine, lysine, proline

  3. Valine, glycine, proline, lysine, phenylalanine, methionine

  4. Methionine, phenylalanine, proline, lysine, valine, glycine

Show answer
Correct Option: D

Select the correct option

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. Direction of RNA Synthesis ----- Direction of reading of template DNA Strand

    3 5------5 3

  2. Direction of RNA Synthesis ----- Direction of reading of template DNA Strand

    5 3------5 3

  3. Direction of RNA Synthesis---- Direction of reading of template DNA Strand

    3 5------3 5

  4. Direction of RNA Synthesis - ---- Direction of reading of template DNA Strand

    5 3 ----- 3 5

Show answer
Correct Option: D

Identify the DNA segment which is not pallindromic

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. 5'-GAATTC -3'

    3'-CTTAAG-5'

  2. 5'-CCCGGG-3'

    3'-GGGCCC-5'

  3. 5-GGATCC-3'

    3' GGTACC-5'

  4. 5'-GCGGCCGC-3'

    3-CGCCGGCG-5'

Show answer
Correct Option: C

The terminator/stop codons UGA, UAG and UAA

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. Initiate translation

  2. Do not code for any amino acid

  3. Code for only one amino acid

  4. Code for more than one amino acid

  5. Initiate transcription

Show answer
Correct Option: B

Which one of the following alternations in DNA is likely to be lethal?

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. Substitution of adenine for cytosine

  2. Substitution of methyl cytosine for cytosine

  3. Deletion of thee nucleotides

  4. Insertion of one nucleotide

Show answer
Correct Option: A

An increased melting temperature for duplex DNA results from a high content of _________________.

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. Adenine$+$ guanine

  2. Cytosine$+$thymine

  3. Cytosine$+$guanine

  4. Adenine$+$ cytosine

Show answer
Correct Option: A

The successive nucleotides of RNA are covalently linked through ______________.

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. Glycoside bonds

  2. Hydrogen bonds

  3. Phosphodiester bonds

  4. Peptide bonds

Show answer
Correct Option: A

In nematode resistance by RNA interference , some specific genes were introduced which form ds RNA these were introduced in ?

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. Nematode

  2. Host plant

  3. Agrobacteroum

  4. All of the above

Show answer
Correct Option: A

The discovery of DNA helix was made by

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. Wilkins

  2. Franklin

  3. Astbury

  4. Chargaff

Show answer
Correct Option: A

Okazaki segments develop in

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. Newly synthesised leading strand

  2. Newly synthesised lagging strand

  3. Master strand

  4. Template strands of DNA

Show answer
Correct Option: A

The double helix of DNA consists of

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. Phosphodiester bonds

  2. Stacking of bases

  3. Base pairing

  4. All of these

Show answer
Correct Option: D

In the case of double-stranded DNA, which of the following base ratios are always equal to one?
a. $(A+T)/(G+C)$
b. $(A+G)/(C+T)$
c. $C/G$
d. $(G+T)/(A+C)$.
Select the correct answer.

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. $1$ and $2$

  2. $1$ and $3$

  3. $2, 3$ and $4$

  4. $1, 3$ and $4$

Show answer
Correct Option: A

In relation to double helical bacterial DNA, match list-I(Parameter) with List-II(Value) and select the correct answer using the codes given the lists.

List-I List-II
a. Diameter of the helix $1$. $34A'$
b. Distance between two adjacent bases $2$. $20A'$
c. Distance between two complete turns $3$. $3A'$
d. Length of the hydrogen bond $4$. $3.4A'$
structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. A-$1$, B-$3$, C-$2$, D-$4$

  2. A-$2$, B-$3$, C-$1$, D-$4$

  3. A-$1$, B-$4$, C-$2$, D-$3$

  4. A-$2$, B-$4$, C-$1$, D-$3$

Show answer
Correct Option: A

The number of hydrogen bonds needed to bind cytosine with guanine in a DNA stand is?

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. One

  2. Two

  3. Three

  4. Four

Show answer
Correct Option: A

In aqueous solution, the alcidine molecules bind to DNA by inserting themselves between adjacent base pairs. The process is called ______________.

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. Depreciation

  2. Substitution

  3. Mutation

  4. Intercalation

Show answer
Correct Option: A

Which of the following pairs is/are correctly matched?
a. E.coli - Circular DNA
b. Tobacco Single - Stranded RNA mosaic virus
c. Reo virus - Double-stranded RNA
Select the correct answer using the codes given.

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. $1$ alone

  2. $1, 2$ and $3$

  3. $1$ and $3$

  4. $2$ and $3$

Show answer
Correct Option: A

The genetic material in the virus $fX _{174}$ is?

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. Single-stranded RNA

  2. Double-stranded RNA

  3. Single-stranded DNA

  4. Double-stranded DNA

Show answer
Correct Option: A

If the sequence of bases in coding strand of DNA is ATTCGATG, then the sequence of bases in mRNA will be

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. TAAGCTAC

  2. UAAGCUAC

  3. ATTCGATG

  4. AUUCGAUG

Show answer
Correct Option: D
Explanation:

mRNA strand is complementary to template strand of DNA, while coding strand has same sequence as RNA (except thymine at the place of uracil). Hence, the sequence of bases in mRNA will be AUUCGAUG.

If one strand of DNA has the base sequence AAGCAA, the complementary strand has which of the following sequences?

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. UUCGUU

  2. TTCGTT

  3. AAGCM

  4. UTCGTU

Show answer
Correct Option: B
Explanation:

The DNA (Deoxyribonucleic acid) molecules have four nucleotide bases along with sugar and phosphate backbone, these four bases are adenine, guanine, thymine, and cytosine. Adenine and thymine are bonded together by two hydrogen bonds while guanine and cytosine are bonded by three hydrogen bonds.

So, the correct option is 'TTCGTT'.

- Hide questions
ADVERTISEMENT

Find more quizzes from top tags

general knowledge
3615 Quizzes
119858 Questions
 technology
307 Quizzes
36705 Questions
 sports
963 Quizzes
19148 Questions
 history
1187 Quizzes
13475 Questions
 physics
598 Quizzes
13441 Questions
 biology
1160 Quizzes
12174 Questions
 science & technology
551 Quizzes
11015 Questions
 chemistry
490 Quizzes
9892 Questions
 maths
518 Quizzes
9324 Questions
 softskills
0 Quizzes
7131 Questions