Question 1

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

Accepted Answer

DNA is transcribed into mRNA, which is then translated into proteins.

Question 2

A nucleotide is composed of which three components?

Accepted Answer

Phosphate group, pentose sugar, and nitrogenous base

Question 3

Which of the following statements about complementary base pairing in DNA is correct?

Accepted Answer

Adenine pairs with thymine via two hydrogen bonds.

Question 4

Why is the anti-parallel orientation of DNA strands important for DNA replication?

Accepted Answer

It ensures that DNA polymerase can add nucleotides only to the 3' end of a growing strand.

Question 5

Which scientist made critical contributions to the discovery of DNA's double helix structure but faced significant barriers due to systemic sexism?

Accepted Answer

Rosalind Franklin

Question 6

What is the significance of the semi-conservative model of DNA replication?

Accepted Answer

Each new DNA molecule consists of one parental and one newly synthesized strand.

Question 7

Which of the following best defines a gene?

Accepted Answer

A segment of DNA that codes for a specific protein or functional RNA.

Question 8

Which of the following is NOT a limitation of DNA polymerase during DNA replication?

Accepted Answer

It can synthesize DNA in both 5' to 3' and 3' to 5' directions.

Question 9

Which of the following best explains why hydrogen bonds form between complementary bases in DNA?

Accepted Answer

Hydrogen bonds form because oxygen and nitrogen atoms create regions of partial negative charge, attracting hydrogen atoms.

Question 10

A mutation occurs that changes a cytosine to a thymine in a DNA sequence. Which type of base pairing will be disrupted?

Accepted Answer

Guanine–cytosine pairing

Question 11

Which of the following best describes the role of replication forks during DNA replication?

Accepted Answer

They are the regions where the double helix is unwound and new DNA strands are synthesized.

Question 12

Which of the following is a correct statement about the directionality of DNA strands?

Accepted Answer

One strand runs 5' to 3', and the other runs 3' to 5'.

Question 13

Which of the following scenarios best illustrates the application of the central dogma in a medical context?

Accepted Answer

A patient with a mutation in a gene produces a malfunctioning protein, leading to a genetic disorder.

Question 14

Which of the following is NOT a component of a DNA nucleotide?

Accepted Answer

Amino acid

Question 15

If a DNA molecule contains 30% adenine, what percentage of thymine would you expect to find?

Accepted Answer

$$30\%$$

Question 16

Which of the following best describes the role of a genome?

Accepted Answer

It is the complete set of genetic instructions for an organism.

Question 17

During DNA replication, what is the function of replication bubbles?

Accepted Answer

They allow multiple regions of the DNA molecule to be replicated simultaneously.

Question 18

Which of the following is a real-world example of how understanding DNA structure can impact medicine?

Accepted Answer

Designing drugs that specifically bind to mutated DNA sequences in cancer cells.

Foundations of Genetics: Principles and DNA Structure

Study Guide - Practice Questions