Question 1

Which of the following best describes the concept of natural selection?

Accepted Answer

The differential survival and reproduction of individuals due to differences in phenotype.

Question 2

Which evidence most strongly supports the theory of evolution by descent with modification?

Accepted Answer

The fossil record showing transitional forms between major groups.

Question 3

A population of beetles is separated by a river, and over time, the two groups develop distinct characteristics and can no longer interbreed. This is an example of:

Accepted Answer

Allopatric speciation

Question 4

Which of the following is a postzygotic barrier to reproduction?

Accepted Answer

Reduced hybrid fertility

Question 5

In phylogenetic trees, a clade is defined as:

Accepted Answer

A group consisting of an ancestor and all its descendants.

Question 6

Which of the following best distinguishes homologous structures from analogous structures?

Accepted Answer

Homologous structures share a common evolutionary origin, while analogous structures do not.

Question 7

Which formula correctly represents the Hardy-Weinberg equilibrium for allele frequencies in a population?

Accepted Answer

$$p^2 + 2pq$$ + $$q^2 = 1$

Question 8

A scientist discovers a bacterium that can survive in extremely salty environments. This bacterium is most likely classified as a:

Accepted Answer

Halophile

Question 9

Which process allows prokaryotes to exchange genetic material directly through a pilus?

Accepted Answer

Conjugation

Question 10

Which of the following statements about Gram staining is correct?

Accepted Answer

Gram-positive bacteria have a thick peptidoglycan layer and stain purple.

Question 11

Which metabolic process is used by prokaryotes to obtain energy from inorganic chemicals, such as hydrogen sulfide, in the absence of light?

Accepted Answer

Chemoautotrophy

Question 12

Which of the following is NOT a feature of protists?

Accepted Answer

They are all multicellular organisms.

Question 13

Endosymbiosis is best supported by which of the following observations?

Accepted Answer

Mitochondria and chloroplasts have their own circular DNA.

Question 14

Which of the following is a real-world example of mutualism involving prokaryotes?

Accepted Answer

Nitrogen-fixing bacteria living in the roots of legumes.

Question 15

Which character state would be most useful for constructing a phylogenetic tree?

Accepted Answer

A trait that varies among the organisms and reflects evolutionary relationships.

Question 16

Which of the following best describes the difference between microevolution and macroevolution?

Accepted Answer

Microevolution refers to small-scale changes in allele frequencies within a population, while macroevolution refers to large-scale evolutionary changes that result in new species.

Question 17

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

Accepted Answer

Temporal isolation

Question 18

Which group of protists is most closely related to animals?

Accepted Answer

Choanoflagellates

Question 19

Which of the following best explains why multicellularity evolved independently in plants, fungi, and animals?

Accepted Answer

Multicellularity is a result of convergent evolution in response to similar selective pressures.

Question 20

A scientist is studying a newly discovered prokaryote that can use light as an energy source and carbon dioxide as a carbon source. This organism is best classified as a:

Accepted Answer

Photoautotroph

Evolution, Phylogeny, Prokaryotes, and Protists: Structured Study Notes

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