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The Central Dogma of Molecular Biology: A Quiz

Description: The Central Dogma of Molecular Biology: A Quiz
Number of Questions: 15
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Tags: molecular biology genetics dna rna protein synthesis
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What is the central dogma of molecular biology?

  1. DNA is transcribed into RNA, which is then translated into protein.

  2. RNA is transcribed into DNA, which is then translated into protein.

  3. Protein is transcribed into DNA, which is then translated into RNA.

  4. Protein is transcribed into RNA, which is then translated into DNA.


Correct Option: A
Explanation:

The central dogma of molecular biology states that the information in DNA is transcribed into RNA, which is then translated into protein. This process is essential for the production of proteins, which are the building blocks of cells and are responsible for a wide range of cellular functions.

What is the role of DNA in the central dogma?

  1. It stores genetic information.

  2. It is transcribed into RNA.

  3. It is translated into protein.

  4. All of the above.


Correct Option: D
Explanation:

DNA stores genetic information, is transcribed into RNA, and is translated into protein. It is the blueprint for all of the proteins that are produced in a cell.

What is the role of RNA in the central dogma?

  1. It carries genetic information from DNA to the ribosome.

  2. It is translated into protein.

  3. It regulates gene expression.

  4. All of the above.


Correct Option: D
Explanation:

RNA carries genetic information from DNA to the ribosome, is translated into protein, and regulates gene expression. It is a versatile molecule that plays a key role in many cellular processes.

What is the role of protein in the central dogma?

  1. It is the final product of gene expression.

  2. It carries out cellular functions.

  3. It regulates gene expression.

  4. All of the above.


Correct Option: D
Explanation:

Protein is the final product of gene expression, carries out cellular functions, and regulates gene expression. It is a complex and essential molecule that plays a vital role in all living organisms.

What is the process by which DNA is transcribed into RNA called?

  1. Replication

  2. Transcription

  3. Translation

  4. Mutation


Correct Option: B
Explanation:

Transcription is the process by which DNA is transcribed into RNA. It is carried out by an enzyme called RNA polymerase, which reads the DNA sequence and synthesizes a complementary RNA molecule.

What is the process by which RNA is translated into protein called?

  1. Replication

  2. Transcription

  3. Translation

  4. Mutation


Correct Option: C
Explanation:

Translation is the process by which RNA is translated into protein. It is carried out by a complex of molecules called the ribosome, which reads the RNA sequence and synthesizes a protein molecule.

What is the genetic code?

  1. The set of rules that determines how DNA is transcribed into RNA.

  2. The set of rules that determines how RNA is translated into protein.

  3. The set of rules that determines how proteins are folded into their functional shapes.

  4. The set of rules that determines how cells divide.


Correct Option: B
Explanation:

The genetic code is the set of rules that determines how RNA is translated into protein. It is a universal code that is shared by all living organisms.

How many codons are there in the genetic code?

  1. 64

  2. 128

  3. 256

  4. 512


Correct Option: A
Explanation:

There are 64 codons in the genetic code. Each codon consists of three nucleotides and codes for a specific amino acid or a stop signal.

What is a stop codon?

  1. A codon that codes for an amino acid.

  2. A codon that codes for a stop signal.

  3. A codon that codes for a start signal.

  4. A codon that codes for a regulatory element.


Correct Option: B
Explanation:

A stop codon is a codon that codes for a stop signal. Stop signals are used to terminate protein synthesis.

What is a start codon?

  1. A codon that codes for an amino acid.

  2. A codon that codes for a stop signal.

  3. A codon that codes for a start signal.

  4. A codon that codes for a regulatory element.


Correct Option: C
Explanation:

A start codon is a codon that codes for a start signal. Start signals are used to initiate protein synthesis.

What is the role of tRNA in protein synthesis?

  1. It carries amino acids to the ribosome.

  2. It reads the mRNA sequence.

  3. It synthesizes the protein chain.

  4. It releases the protein from the ribosome.


Correct Option: A
Explanation:

tRNA carries amino acids to the ribosome. Each tRNA molecule is specific for a particular amino acid.

What is the role of mRNA in protein synthesis?

  1. It carries genetic information from DNA to the ribosome.

  2. It is translated into protein.

  3. It regulates gene expression.

  4. All of the above.


Correct Option: D
Explanation:

mRNA carries genetic information from DNA to the ribosome, is translated into protein, and regulates gene expression. It is a versatile molecule that plays a key role in protein synthesis.

What is the role of the ribosome in protein synthesis?

  1. It reads the mRNA sequence.

  2. It synthesizes the protein chain.

  3. It releases the protein from the ribosome.

  4. All of the above.


Correct Option: D
Explanation:

The ribosome reads the mRNA sequence, synthesizes the protein chain, and releases the protein from the ribosome. It is a complex molecular machine that is essential for protein synthesis.

What is the final product of protein synthesis?

  1. A polypeptide chain.

  2. A protein.

  3. An amino acid.

  4. A nucleotide.


Correct Option: B
Explanation:

The final product of protein synthesis is a protein. Proteins are made up of polypeptide chains, which are chains of amino acids.

What is the function of proteins in cells?

  1. They carry out cellular functions.

  2. They regulate gene expression.

  3. They provide structural support.

  4. All of the above.


Correct Option: D
Explanation:

Proteins carry out cellular functions, regulate gene expression, and provide structural support. They are essential for all living organisms.

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