Question 1

Which of the following statements best describes the relationship between genotype and phenotype?

Accepted Answer

Genotype is the genetic makeup that determines the physiological and physical traits (phenotype) of an organism.

Question 2

Which of the following is TRUE regarding prokaryotic and eukaryotic genomes?

Accepted Answer

Eukaryotic cells have numerous linear chromosomes housed in the nucleus, while prokaryotic cells usually have a single circular chromosome.

Question 3

Which of the following best describes the structure of DNA?

Accepted Answer

DNA is a double-stranded molecule with antiparallel strands and complementary base pairing.

Question 4

During DNA replication, which enzyme is responsible for unwinding the DNA helix?

Accepted Answer

Helicase

Question 5

What is the main difference between the leading and lagging strands during DNA replication?

Accepted Answer

The leading strand is synthesized continuously, while the lagging strand is synthesized in Okazaki fragments.

Question 6

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

Accepted Answer

Uracil base

Question 7

Which process describes the flow of genetic information from DNA to RNA to protein?

Accepted Answer

Central dogma

Question 8

What is the function of RNA polymerase during transcription?

Accepted Answer

It binds to the promoter, unwinds DNA, and synthesizes RNA from the DNA template.

Question 9

Which of the following best explains why the genetic code is described as redundant?

Accepted Answer

A single amino acid can be coded by multiple codons.

Question 10

A mutation that changes a codon from coding for an amino acid to a stop codon is called:

Accepted Answer

Nonsense mutation

Question 11

Which of the following is a correct description of plasmids?

Accepted Answer

They are pieces of DNA that exist outside of chromosomal DNA and often confer survival advantages.

Question 12

Which enzyme is responsible for joining Okazaki fragments on the lagging strand during DNA replication?

Accepted Answer

Ligase

Question 13

Which of the following statements about RNA is FALSE?

Accepted Answer

RNA contains thymine instead of uracil.

Question 14

Which of the following best describes the role of histones in eukaryotic cells?

Accepted Answer

They are proteins that help organize and package DNA in the nucleus.

Question 15

If a DNA strand has the sequence 5'-ATGCGT-3', what is the complementary DNA strand sequence?

Accepted Answer

3'-TACGCA-5'

Question 16

Which of the following is a function of single-strand DNA-binding proteins during DNA replication?

Accepted Answer

They keep the DNA strands separated until they are copied.

Question 17

Which of the following is NOT a step in the process of transcription?

Accepted Answer

Translation

Question 18

What is the directionality of DNA synthesis by DNA polymerase III?

Accepted Answer

$$5' \rightarrow 3'$$

Question 19

Which of the following best explains why the number of chromosomes does not determine organism sophistication?

Accepted Answer

The organization and function of genes, not the number of chromosomes, determine complexity.

Question 20

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

Accepted Answer

Adenine pairs with thymine

Genetics: Structure, Function, and Expression of Genetic Material in Microbiology

Study Guide - Practice Questions