Q: A population of beetles has a carrying capacity ($$K) of 500 $$individuals. If the current population size ($$N) is 250 $$and the intrinsic rate of increase ($$r) is 0.2$$, what is the expected change in population size according to the logistic growth equation $$\Delta N = rN \left(1 - \frac{N}{K}\right)$$?

$$\Delta N = 0.2 \times 250 \left(1 - \frac{250}{500}\right) = 25$$

Question 1

Which of the following is NOT one of the main characteristics that describe all living things?

Accepted Answer

Ability to photosynthesize

Question 2

Which scientist is most closely associated with the theory of natural selection?

Accepted Answer

Charles Darwin

Question 3

A population of beetles has a carrying capacity ($$K) of 500 $$individuals. If the current population size ($$N) is 250 $$and the intrinsic rate of increase ($$r) is 0.2$$, what is the expected change in population size according to the logistic growth equation $$\Delta N = rN \left(1 - \frac{N}{K}\right)$$?

Accepted Answer

$$\Delta N = 0.2 	imes 250 \left(1 - \frac{250}{500}ight) = 25$$

Question 4

Which of the following best describes stabilizing selection?

Accepted Answer

Selection that favors the average phenotype and reduces variation

Question 5

Which of the following is an example of a pre-zygotic reproductive isolating mechanism?

Accepted Answer

Temporal isolation

Question 6

Which process allows bacteria to exchange genetic material through direct contact?

Accepted Answer

Conjugation

Question 7

Which of the following best explains the difference between allopatric and sympatric speciation?

Accepted Answer

Allopatric speciation requires geographic isolation, while sympatric speciation occurs without it.

Question 8

Which of the following is a density-independent factor that can affect population growth?

Accepted Answer

Natural disasters

Question 9

Which of the following is NOT a component of a prokaryotic cell?

Accepted Answer

Nucleus

Question 10

Which of the following best describes the greenhouse effect?

Accepted Answer

The trapping of heat in Earth's atmosphere by greenhouse gases

Question 11

Which of the following is an example of mutualism?

Accepted Answer

Bees pollinating flowers while collecting nectar

Question 12

Which of the following best describes the role of Charles Keeling in ecology?

Accepted Answer

He measured atmospheric carbon dioxide and documented its rise.

Question 13

Which equation best represents exponential population growth?

Accepted Answer

$$\frac{dN}{dt} = rN$$

Question 14

Which of the following is a real-world example of competitive exclusion?

Accepted Answer

Two species of barnacles occupying different zones on a rocky shore

Question 15

Which of the following is true about the biological species concept (BSC)?

Accepted Answer

Species are groups of interbreeding natural populations that are reproductively isolated from other such groups.

Question 16

Which of the following is a consequence of mass extinction events?

Accepted Answer

Decrease in biodiversity followed by adaptive radiation

Question 17

Which of the following is an example of a keystone species?

Accepted Answer

Sea otters maintaining kelp forest ecosystems

Question 18

Which of the following is NOT a way that prokaryotes reproduce?

Accepted Answer

Budding

Question 19

Which of the following best describes the process of eutrophication?

Accepted Answer

Excess nutrients lead to algal blooms, which deplete oxygen and create 'dead zones'

Question 20

Which of the following is a real-world example of co-evolution?

Accepted Answer

The relationship between flowering plants and their pollinators

General Biology: Study Guide on Evolution, Diversity, and Ecology

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