Question 1

Which of the following best describes the difference between genotype and phenotype?

Accepted Answer

Genotype is the combination of alleles an organism has, while phenotype is the physical expression of those alleles.

Question 2

During DNA replication, which enzyme is responsible for adding new nucleotides to the growing DNA strand?

Accepted Answer

DNA polymerase

Question 3

A mutation occurs in a bacterial gene that prevents the production of a repressor protein. What is the most likely outcome for the expression of that gene?

Accepted Answer

The gene will be continuously expressed, regardless of environmental conditions.

Question 4

Which of the following best explains why telomeres are important for eukaryotic chromosomes?

Accepted Answer

They prevent the loss of important genetic information during DNA replication.

Question 5

Which process is described by the central dogma of molecular biology?

Accepted Answer

DNA → RNA → Protein

Question 6

A eukaryotic cell is exposed to a drug that prevents chromatin from loosening. What is the most likely effect on gene expression?

Accepted Answer

Gene expression will decrease because transcription factors cannot access DNA.

Question 7

Which of the following is a real-world example of evolution by natural selection?

Accepted Answer

A population of bacteria becomes resistant to an antibiotic after repeated exposure.

Question 8

Which of the following conditions is NOT required for Hardy-Weinberg equilibrium?

Accepted Answer

Natural selection

Question 9

A population of frogs is split by a newly formed river, and over thousands of years, the two groups become genetically distinct and can no longer interbreed. What is this process called?

Accepted Answer

Allopatric speciation

Question 10

Which of the following statements about mitochondria supports the endosymbiotic theory?

Accepted Answer

Mitochondria have their own circular DNA similar to bacterial DNA.

Question 11

Which of the following best describes the alternation of generations in plants?

Accepted Answer

Plants alternate between multicellular haploid and multicellular diploid stages.

Question 12

Why are fungal infections in humans often difficult to treat?

Accepted Answer

Fungi are more closely related to animals than to plants, so drugs that harm fungi may also harm human cells.

Question 13

Which of the following is a characteristic shared by all animals?

Accepted Answer

They are multicellular and obtain energy by ingesting other organisms.

Question 14

Which of the following best explains why insects are the most diverse group of animals on Earth?

Accepted Answer

They have evolved wings and specialized mouthparts, allowing them to exploit many environments.

Question 15

Which of the following is NOT a difference between Bacteria and Archaea?

Accepted Answer

Presence of a nucleus

Question 16

A scientist finds a fossil with bilateral symmetry, a head region, and evidence of a complete digestive tract. To which group does this organism most likely belong?

Accepted Answer

Animals

Question 17

Which of the following best describes the role of tRNA during translation?

Accepted Answer

tRNA carries amino acids to the ribosome and matches them to the mRNA codon using its anticodon.

Question 18

Which of the following is an example of heterozygote advantage?

Accepted Answer

Individuals with one sickle cell allele and one normal allele are more resistant to malaria than either homozygote.

Question 19

Which of the following statements about the Cambrian explosion is correct?

Accepted Answer

It was a period when most major animal groups appeared in the fossil record.

Question 20

Which of the following adaptations helped vertebrates successfully colonize land?

Accepted Answer

Development of lungs and amniotic eggs

Genetics, Evolution, and the Diversity of Life: Study Notes

Study Guide - Practice Questions

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