Question 1

Which of the following best describes an emergent property in biological systems?

Accepted Answer

A property that arises from the arrangement and interaction of parts within a system, such as consciousness emerging from neural networks.

Question 2

A scientist is studying a population of beetles. She observes that beetles with darker shells survive better in a forest after a fire, while lighter beetles are more easily seen by predators. Which type of natural selection is most likely occurring in this scenario?

Accepted Answer

Directional selection

Question 3

Which of the following statements about the Hardy-Weinberg equation is correct?

Accepted Answer

It predicts the expected genotype frequencies in a non-evolving population using the equation $$p^2 + 2pq$$ + $$q^2 = 1$.

Question 4

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

Accepted Answer

Two species of frogs breed in different seasons and never mate.

Question 5

Which of the following best explains why the fossil record is incomplete?

Accepted Answer

Many organisms did not fossilize because they lacked hard parts or lived in environments not conducive to fossilization.

Question 6

A population of birds is separated by a newly formed river, and over time, the two groups evolve into distinct species. This is an example of:

Accepted Answer

Allopatric speciation

Question 7

Which of the following is a correct statement about the flow of energy and cycling of matter in ecosystems?

Accepted Answer

Energy flows through ecosystems in one direction, while matter cycles within ecosystems.

Question 8

Which of the following is an example of convergent evolution?

Accepted Answer

Wings of bats and wings of insects, which evolved independently for flight.

Question 9

A researcher observes that a certain antibiotic is no longer effective against a bacterial infection in a hospital. Over several years, the frequency of an allele conferring resistance increases in the bacterial population. This is an example of:

Accepted Answer

Evolution by natural selection

Question 10

Which of the following best describes the Founder Effect?

Accepted Answer

A small group of individuals establishes a new population, and the gene pool differs from the original population.

Question 11

Which of the following is NOT a domain of life?

Accepted Answer

Protista

Question 12

Which of the following is an example of negative feedback regulation in biological systems?

Accepted Answer

Blood glucose levels are regulated by insulin, which lowers glucose when it is high.

Question 13

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

Accepted Answer

Homologous structures share a common evolutionary origin, while analogous structures have similar function but evolved independently.

Question 14

Which of the following is a limitation of the biological species concept?

Accepted Answer

It cannot be applied to asexual organisms or fossils.

Question 15

Which event is associated with the 'oxygen revolution' in Earth's history?

Accepted Answer

The evolution of photosynthetic prokaryotes that released $$O_2$$ into the atmosphere.

Question 16

A population of plants is exposed to a new herbicide. Some individuals survive due to a mutation that confers resistance. Over time, the frequency of the resistance allele increases. Which mechanism of evolution is primarily responsible?

Accepted Answer

Natural selection

Question 17

Which of the following best illustrates the concept of adaptive radiation?

Accepted Answer

A single ancestral species rapidly diversifies into many new species, such as Darwin’s finches on the Galápagos Islands.

Question 18

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

Accepted Answer

A horse and a donkey mate to produce a sterile mule.

Question 19

Which of the following best describes the process of endosymbiosis?

Accepted Answer

A eukaryotic cell engulfed a prokaryotic cell, which then became an organelle such as a mitochondrion.

Question 20

Which of the following is a correct application of deductive reasoning in biology?

Accepted Answer

If all cells come from pre-existing cells, and bacteria are made of cells, then bacteria must come from pre-existing cells.

Themes of Biology and Evolution: Study Guide

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