$$\text{DNA} \rightarrow \text{RNA} \rightarrow \text{Protein}$$

Question 1

Which of the following best describes the central dogma of molecular biology?

Accepted Answer

$$	ext{DNA} ightarrow 	ext{RNA} ightarrow 	ext{Protein}$$

Question 2

Which component is NOT part of a nucleotide found in DNA?

Accepted Answer

Uracil

Question 3

What is the main difference between the sugar found in DNA and RNA?

Accepted Answer

DNA contains deoxyribose, RNA contains ribose

Question 4

Which of the following base pairs is unique to DNA and not found in RNA?

Accepted Answer

Adenine–Thymine

Question 5

A gene is best defined as:

Accepted Answer

A segment of DNA that specifies the sequence of a polypeptide or functional RNA molecule

Question 6

Which type of RNA carries genetic information from DNA to the ribosome for protein synthesis?

Accepted Answer

Messenger RNA (mRNA)

Question 7

What is the function of ribosomal RNA (rRNA)?

Accepted Answer

It forms structural components of ribosomes

Question 8

Which of the following statements about exons is TRUE?

Accepted Answer

Exons are coding regions of DNA that remain in mature RNA after splicing

Question 9

Which chemical bond links nucleotides together in the backbone of DNA and RNA?

Accepted Answer

Phosphodiester bond

Question 10

In the process of transcription, which molecule is synthesized?

Accepted Answer

RNA

Question 11

Which nitrogenous base is present in RNA but not in DNA?

Accepted Answer

Uracil

Question 12

If a DNA molecule contains 30% adenine, what percentage of thymine does it contain?

Accepted Answer

30%

Question 13

Which of the following is a purine base found in nucleic acids?

Accepted Answer

Adenine

Question 14

Which process allows the genetic information in DNA to be copied into RNA?

Accepted Answer

Transcription

Question 15

Which of the following statements about the human genome is correct?

Accepted Answer

Only about 1.5% of the human genome consists of exons

Question 16

Which of the following best explains why thymine is used in DNA instead of uracil?

Accepted Answer

Thymine is more stable and less prone to mutation than uracil

Question 17

Which of the following is TRUE regarding spatial gene expression?

Accepted Answer

Different cells express different genes depending on their function

Question 18

Which of the following is the correct sequence of events in protein synthesis?

Accepted Answer

Replication $$\rightarrow$$ Transcription $$\rightarrow$$ Translation

Question 19

Which of the following statements about nucleic acids is FALSE?

Accepted Answer

RNA contains thymine as a nitrogenous base

Question 20

A mutation occurs in a gene such that an exon is deleted. What is the most likely consequence?

Accepted Answer

The mature RNA will be missing a coding region, potentially leading to a nonfunctional protein

Nucleic Acids: Structure, Function, and Biological Significance

Study Guide - Practice Questions