Question 1

Which of the following best explains why corn (Zea mays) has more genes than humans, even though humans are more complex organisms?

Accepted Answer

Gene number alone does not determine complexity; regulatory DNA, alternative splicing, and protein interactions contribute to complexity.

Question 2

A scientist is comparing the genomes of two closely related bird species. Which tool or field is most essential for analyzing their DNA sequences and predicting gene functions?

Accepted Answer

Bioinformatics

Question 3

Which of the following scenarios best illustrates the founder effect as a form of genetic drift?

Accepted Answer

A few birds colonize a new island, and their descendants show different allele frequencies than the original population.

Question 4

In a population of 1,000 individuals, the frequency of the dominant allele $$p is 0.6 $$and the recessive allele $$q is 0.4. $$According to the Hardy-Weinberg equation, what is the expected frequency of heterozygotes?

Accepted Answer

$$0.48$$

Question 5

Which of the following is an example of a postzygotic reproductive barrier?

Accepted Answer

Hybrid offspring are sterile and cannot produce their own offspring.

Question 6

Which event in Earth's history is most directly responsible for the rapid diversification of animal phyla known as the Cambrian Explosion?

Accepted Answer

A dramatic increase in atmospheric oxygen, genetic innovations, and new ecological interactions

Question 7

Which of the following statements about endosymbiotic theory is supported by evidence from modern cells?

Accepted Answer

Mitochondria and chloroplasts have their own circular DNA and divide independently of the cell.

Question 8

A phylogenetic tree shows that whales and hippos share a more recent common ancestor with each other than with other mammals. What does this imply about their evolutionary relationship?

Accepted Answer

Whales and hippos are more closely related to each other than to other mammals.

Question 9

Which of the following is a derived character unique to angiosperms among land plants?

Accepted Answer

Double fertilization resulting in the formation of endosperm

Question 10

Which adaptation allowed seed plants to colonize dry terrestrial environments more successfully than seedless plants?

Accepted Answer

The evolution of pollen, which enables fertilization without free-standing water

Question 11

Which of the following best describes the mutualistic relationship found in mycorrhizae?

Accepted Answer

Fungi provide minerals and water to plant roots, while plants supply sugars to fungi.

Question 12

Which feature distinguishes animals from both plants and fungi?

Accepted Answer

Animals are ingestive heterotrophs that lack cell walls.

Question 13

A researcher discovers a new worm species with a complete digestive tract and a pseudocoelom. To which phylum does this organism most likely belong?

Accepted Answer

Nematoda (roundworms)

Question 14

Which evolutionary innovation allowed vertebrates to reproduce away from water and colonize terrestrial habitats?

Accepted Answer

The amniotic egg, which contains protective membranes and a food supply for the embryo

Question 15

Which of the following is a correct sequence of evolutionary innovations in vertebrate history?

Accepted Answer

Notochord → Jaws → Limbs → Amniotic egg → Hair

Question 16

Which of the following is a unique feature of mammals that distinguishes them from all other vertebrates?

Accepted Answer

Presence of hair and mammary glands

Question 17

Which animal group is characterized by a chitinous exoskeleton, jointed appendages, and undergoes molting (ecdysis)?

Accepted Answer

Arthropods

Question 18

Which of the following best describes the difference between homologous and analogous structures?

Accepted Answer

Homologous structures share a common ancestry, while analogous structures share a similar function but evolved independently.

Question 19

Which of the following is a real-world example of disruptive selection?

Accepted Answer

A population of birds where individuals with either very small or very large beaks survive better than those with intermediate beak sizes due to the availability of only small and large seeds.

Question 20

Which of the following best explains why lichen are important in ecological succession?

Accepted Answer

Lichens are often the first organisms to colonize bare rock, breaking it down and creating soil for other species.

General Biology: Evolution, Diversity, and the Tree of Life (Chapters 21–34 Study Guide)

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