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DNA Sequencing

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Which one of the following ‘Year: Event’ pairs is not correct?

  1. 1956 - DNA is made artificially

  2. 1969 - The first single gene is isolated

  3. 1970 - The first artificial gene

  4. 1983 - The first artificial chromosome

  5. 1998 – First draft of human genome is published


Correct Option: E
Explanation:

The genome of the first multicelled animal, the nematode worm Caenorhabditis elegans, was sequenced, containing approximately 18,000 genes. In 2000, the first draft of the human genome was announced and was published in 2001.

The first DNA-based genome sequence is ______

  1. Lambda phage

  2. P1 phage

  3. T4 phage

  4. MS2 phage

  5. phi X 174 phage


Correct Option: E
Explanation:

The phi X 174 bacteriophage was the first DNA-based genome to be sequenced. This work was completed by Fred Sanger and his team in 1977.

Which among the following statements is/are not correct?

  1. The start codon always codes for methionine in eukaryotes.
  2. The most common start codon is AUG.
  3. The anticodon is a sequence of three base pairs of the tRNA that is complementary to the matching three base pairs on the mRNA.
  4. The termination codon is a nucleotide triplet within tRNA that signals the termination of translation.
  1. Only 1

  2. Only 2

  3. 1 and 2

  4. 1, 2 and 3

  5. Only 4


Correct Option: E
Explanation:

This option is correct because the stop codon or termination codon is a nucleotide triplet within mRNA that signals a termination of translation.

The bacteriophages which infects the Bacillus subtilis is _________.

  1. P2 phage

  2. phi 29 phage

  3. Lambda phage

  4. T12 phage

  5. T2 phage


Correct Option: B
Explanation:

Bacillus phage phi 29 (Φ29 phage) infects Bacillus subtilis.

Identify the incorrect statement/s.

  1. A cloning vector is a small piece of DNA into which a foreign DNA fragment can be inserted for cloning purposes.

  2. Shuttle vectors can be used in both eukaryotes and prokaryotes.

  3. Plasmids that can be propagated in cells of two or more different species are called expression vectors.

  4. Plasmids are circular pieces of double stranded DNA that exist separately from chromosomal DNA.

  5. Replacement vector is a cloning vector in which part of the normal genome is replaced by foreign DNA.


Correct Option: C
Explanation:

Plasmids that can be propagated in cells of two or more different species are called shuttle vectors. An expression vector is generally a plasmid that is used to introduce a specific gene into a target cell.

Which of the following enzymes is derived from Bacillus licheniformis?

  1. Alkaline protease

  2. Neutral protease

  3. Pullulanase

  4. Penicillin amidase

  5. β-glucanase


Correct Option: A
Explanation:

Alkaline protease is derived from Bacillus licheniformis.

Which among the following statements is/are not true?

  1. The Northern blotting is a laboratory method used to detect specific RNA molecules from a mixture of RNA molecules.

  2. PCR is a laboratory technique for amplifying a specific DNA sequence.

  3. Electroporation used to transfer polar molecules like DNA into host cells.

  4. The Southern blotting technique depends on similarities between the sequences of probe RNA and experimental RNA.

  5. Gel electrophoresis is a basic technique used to separate DNA, RNA or proteins.


Correct Option: D
Explanation:

The Southern blotting technique is a laboratory method used to detect specific DNA molecules from among a many other DNA molecules. The Southern blotting technique depends on similarities between the sequences of probe DNA and experimental DNA.

Which of the following antibiotics are derived from the members of genus of the family Streptomycetaceae?

  1. Oxytetracycline, Bacitracin, Streptomycin

  2. Chloramphenicol, Penicillin, Griseofulvin

  3. Chloramphenicol, Oxytetracycline, Streptomycin

  4. Chloramphenicol, Griseofulvin, Oxytetracycline

  5. Streptomycin, Griseofulvin, Penicillin


Correct Option: C
Explanation:

Streptomycin: Streptomyces griseus Chloramphenicol: Streptomyces venezuelae Oxytetracycline: Streptomyces rimosus All are derived from members of genus of the family Streptomycetaceae.

Which of the sets represents only filamentous type of bacteriophages?

  1. MS2 phage, T12 phage, f1 phage

  2. M13 phage, f1 phage, fd phage

  3. M13 phage, T12 phage, fd phage

  4. M13 phage, MS2 phage, f1 phage

  5. T2 phage, f1 phage, fd phage


Correct Option: B
Explanation:

M13 is a filamentous bacteriophage composed of circular single stranded DNA (ssDNA). Filamentous bacteriophage fd is a type of filamentous bacteriophage known to infect Escherichia coli. Bacteriophage f1 is structurally classified as a class I filamentous phage.

The pair which belongs to starch-debranching enzyme is ________

  1. pullulanase and isoamylase

  2. glucose isomerase and amylase

  3. glucoamylase and amylase

  4. isoamylase and amylase

  5. glucoamylase and pullulanase


Correct Option: A
Explanation:

Pullulanase and isoamylase: Both are glucose debranching enzymes.

Which of the following is incorrectly matched?

  1. G. W. Carver – Father of agricultural biotechnology

  2. G. J. Mendel – Father of human genetics

  3. Haberlandt – Father of plant tissue culture

  4. Karl Ereky – Coined the term biotechnology

  5. Wilhelm Johannsen – Coined the term gene


Correct Option: B
Explanation:

 G. J. Mendel – Father of genetics Archibald Garrod – Father of human genetics

Which one of the following pairs is not correctly matched?

  1. Cryopreservation: Preserving germplasm in a frozen state

  2. Biolistics: The technique of using very small metal particles coated with desired gene in the gene transfer

  3. Biopotency: The measure of the ability of a material to have a specified biochemical function.

  4. Bioethics: A moral guidance to the problems in biology

  5. Biopiracy : An exploitation of bioresources without authentic permission


Correct Option: D
Explanation:

Bioethics is a set of standards used to regulate own or community activity in relation to the biological world.

Choose the correct statement.

  1. 11 base pairs are present in one turn of DNA.

  2. Anticodon occurs in transfer-RNA.

  3. Adenine is an amino acid.

  4. Distance between two strands of DNA is 15 Å.

  5. Distance between two base pairs of DNA is 34 nm.


Correct Option: B
Explanation:

An anticodon is a unit made up of three nucleotides that correspond to the three bases of the codon on the mRNA. Each tRNA contains a specific anticodon triplet sequence that can base-pair to one or more codons for an amino acid.

Identify the incorrectly matched pair?

  1. Adenosine: Adenine and ribose sugar

  2. Guanidine: Guanine and ribose sugar

  3. Nucleotide: Nitrogen base, sugar and phosphate

  4. Nucleoside: Pentose sugar and nitrogen base

  5. Both 2 and 4


Correct Option: B
Explanation:

Guanine linked to ribose is called guanosine. Guanidine is a strongly alkaline crystalline compound formed by the oxidation of guanine.

Match the column-I with column-I ||| |---|---| |Column I |Column II| |1. Recombinant DNA technology|a. Technique for identification of patterns that occur in DNA| |2. Restriction fragments|b. All the genes contained in one kind of organism| |3. Genomic library|c. Pieces of DNA that have been cut into different lengths| |4. Restriction enzymes|d. DNA cutting enzymes| |5. DNA fingerprinting|e. Combining genes from different species| | |f. A collection of cloned DNA pieces from a genome.|

  1. 1 - e, 2 - c, 3 - f, 4 - d, 5 - a

  2. 1 - a, 2 - c, 3 - b, 4 - d, 5 - e

  3. 1 - f, 2 - d, 3 - a, 4 - c, 5 - b

  4. 1 - a, 2 - b, 3 - d, 4 - a, 5 - f

  5. 1 - b, 2 - c, 3 - a, 4 - d, 5 - e


Correct Option: A
Explanation:

This option is correct because all are correctly matched. Recombinant DNA technology is a technology that combines genes from different sources into a single DNA molecule. Restriction fragments are pieces of DNA that have been cut into different lengths. A genomic library is a collection of cloned DNA pieces from a genome. Restriction enzymes are enzymes isolated from bacteria that recognise specific sequences in DNA and then cut the DNA to produce fragments, called restriction fragments. DNA fingerprinting is a method of isolating and making images of sequences of DNA.

 

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