Question 1

Which of the following best describes the term 'genome' in a cell?

Accepted Answer

The sum total of genetic material (DNA) in a cell

Question 2

Which of the following statements correctly distinguishes genotype from phenotype?

Accepted Answer

Genotype is the genetic makeup of an organism, while phenotype is the observable traits resulting from gene expression

Question 3

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

Accepted Answer

Ribose sugar

Question 4

What type of bond is formed between adjacent nucleotides in a DNA strand?

Accepted Answer

Phosphodiester bond

Question 5

Which base pairing in DNA is more stable and why?

Accepted Answer

Guanine-Cytosine, because it forms three hydrogen bonds

Question 6

In the structure of DNA, what is found at the 5' end and what is found at the 3' end of a nucleotide?

Accepted Answer

5' end: phosphate group; 3' end: hydroxyl group

Question 7

Which of the following is a key difference between DNA and RNA?

Accepted Answer

RNA is typically single-stranded and contains ribose sugar

Question 8

Why is DNA generally more stable than RNA?

Accepted Answer

DNA is double-stranded and lacks the 2' hydroxyl group present in RNA

Question 9

Which of the following types of RNA is most likely to be degraded quickly in the cell?

Accepted Answer

mRNA

Question 10

Which enzyme is responsible for introducing supercoils into prokaryotic DNA?

Accepted Answer

DNA gyrase

Question 11

Which of the following best describes the packaging of eukaryotic DNA?

Accepted Answer

DNA is wrapped around histone proteins to form nucleosomes

Question 12

A virus is found to have its genetic material as RNA. Which statement is correct regarding its genome?

Accepted Answer

Viruses can have either DNA or RNA as their genome

Question 13

Which of the following is a function of rRNA in the cell?

Accepted Answer

Forms the major part of the ribosome and participates in protein synthesis

Question 14

Which of the following statements about bacterial chromosomes is correct?

Accepted Answer

Bacterial chromosomes are a single circular loop

Question 15

Which process is responsible for the formation of a phosphodiester bond during nucleic acid synthesis?

Accepted Answer

Removal of two phosphate groups from a nucleotide triphosphate

Question 16

Which of the following best explains why tRNA and rRNA are more stable than mRNA?

Accepted Answer

They have extensive secondary and tertiary structures that protect them from degradation

Question 17

Which of the following is a correct pairing of nitrogenous bases in DNA?

Accepted Answer

Adenine pairs with thymine

Question 18

Which of the following is true regarding the directionality of DNA strands?

Accepted Answer

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

Question 19

Which of the following is a real-world application of understanding genotype and phenotype in medicine?

Accepted Answer

Diagnosing a genetic disorder based on the presence of a specific gene mutation

Question 20

A scientist is studying a eukaryotic cell and observes DNA wrapped around proteins forming a bead-like structure. What is this structure called?

Accepted Answer

Nucleosome

Biochemistry of the Genome: Structure and Function of Genetic Material

Study Guide - Practice Questions