Question 1

Which of the following best describes the primary purpose of DNA replication in living organisms?

Accepted Answer

To transmit genetic information to the next generation

Question 2

Which statement correctly explains how DNA replication transmits genetic information to offspring?

Accepted Answer

DNA replication ensures that each daughter cell receives an exact copy of the genetic material

Question 3

What are the two main types of nucleic acids found in cells, and what is their primary function?

Accepted Answer

DNA and RNA; DNA stores genetic information and RNA helps in protein synthesis

Question 4

Which of the following correctly describes the structure of a nucleotide?

Accepted Answer

A nucleotide consists of a phosphate group, a sugar, and a nitrogenous base

Question 5

Using the figure, what is a key structural difference between DNA and RNA?

Accepted Answer

DNA contains deoxyribose sugar, while RNA contains ribose sugar

Question 6

Which experiment provided evidence that DNA is the hereditary material?

Accepted Answer

Hershey and Chase's experiment using bacteriophages and radioactive labeling

Question 7

What is meant by the 'directionality' of a nucleotide strand?

Accepted Answer

It refers to the orientation of the phosphate and sugar groups, with strands running from 5' to 3'

Question 8

According to Chargaff's rule, which of the following is true for double-stranded DNA?

Accepted Answer

The amount of adenine equals the amount of thymine

Question 9

How does Chargaff's rule help distinguish between DNA and RNA?

Accepted Answer

DNA has equal amounts of A and T, while RNA has uracil instead of thymine

Question 10

Which bonds hold the two strands of DNA together in the double helix?

Accepted Answer

Hydrogen bonds between complementary nitrogenous bases

Question 11

Which enzyme is responsible for synthesizing new DNA strands during replication?

Accepted Answer

DNA polymerase

Question 12

If DNA replication occurs at a temperature outside the enzyme's optimal range, what is the most likely effect?

Accepted Answer

Replication will slow down or stop due to enzyme denaturation

Question 13

Which of the following is a common mistake that can occur during DNA replication?

Accepted Answer

Insertion of incorrect nucleotides

Question 14

Which agent is most likely to cause DNA damage by forming thymine dimers?

Accepted Answer

UV light

Question 15

What is the main mechanism by which cells repair thymine dimers caused by UV light?

Accepted Answer

Nucleotide excision repair

Question 16

Which structural feature of eukaryotic chromosomes complicates DNA replication?

Accepted Answer

Linear chromosomes with multiple origins of replication

Question 17

What is the role of telomeres in chromosomes?

Accepted Answer

They protect chromosome ends from degradation

Question 18

How does telomerase contribute to aging and cancer?

Accepted Answer

Telomerase lengthens telomeres, allowing cells to divide indefinitely

Question 19

What is the function of restriction enzymes in genetic engineering?

Accepted Answer

They cut DNA at specific sequences

Question 20

During gel electrophoresis, what property of DNA allows it to move through the gel?

Accepted Answer

Its negative charge due to phosphate groups

Genetic Information Flow, DNA Structure, Replication, and Genetic Engineering

Study Guide - Practice Questions