Q: During a laboratory experiment, students observe that a population of beetles has a gene with two alleles: $$A$$ and $$a. If $$the frequency of $$A is 0.7$$, what is the expected frequency of heterozygotes ($$Aa) $$under Hardy-Weinberg equilibrium?

$$2pq = 2 \times 0.7 \times 0.3 = 0.42$$

Question 1

Which of the following best describes the process of evolution as covered in the course objectives?

Accepted Answer

Evolution is the process by which populations of organisms change over generations through genetic variation and natural selection.

Question 2

A student is studying the differences between prokaryotic and eukaryotic cells. Which of the following is a correct distinction?

Accepted Answer

Eukaryotic cells have a nucleus enclosed by a membrane, whereas prokaryotic cells lack a true nucleus.

Question 3

Which equation best represents the Hardy-Weinberg equilibrium for a population with two alleles, $$p$$ and $$q$$?

Accepted Answer

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

Question 4

During a laboratory experiment, students observe that a population of beetles has a gene with two alleles: $$A$$ and $$a. If $$the frequency of $$A is 0.7$$, what is the expected frequency of heterozygotes ($$Aa) $$under Hardy-Weinberg equilibrium?

Accepted Answer

$$2pq = 2 	imes 0.7 	imes 0.3 = 0.42$$

Question 5

Which of the following is NOT a characteristic used to classify animal phyla?

Accepted Answer

Color of the organism

Question 6

A biologist is studying a newly discovered organism. It is multicellular, lacks cell walls, and is heterotrophic. To which kingdom does this organism most likely belong?

Accepted Answer

Animalia

Question 7

Which of the following best explains why genetic drift has a greater effect on small populations than on large populations?

Accepted Answer

Random changes in allele frequencies are more likely to significantly alter the gene pool in small populations.

Question 8

In a population of 1000 individuals, 360 show the recessive phenotype for a trait controlled by a single gene with two alleles. What is the frequency of the recessive allele ($$q$$)?

Accepted Answer

$$q = \sqrt{360/1000} = 0.6$$

Question 9

Which of the following scenarios best illustrates the concept of natural selection?

Accepted Answer

A population of moths changes color over generations because darker moths survive better in polluted environments.

Question 10

Which of the following is a correct application of the binomial nomenclature system?

Accepted Answer

Homo sapiens

Question 11

Which of the following best describes the role of decomposers in an ecosystem?

Accepted Answer

Decomposers break down dead organic matter, recycling nutrients back into the ecosystem.

Question 12

A population of rabbits is introduced to an island. Over time, the population grows rapidly, then levels off. Which equation best models this population growth?

Accepted Answer

$$\frac{dN}{dt} = rN \left(1 - \frac{N}{K}\right)$$

Question 13

Which of the following is a direct result of gene flow between populations?

Accepted Answer

Increased genetic similarity between populations

Question 14

Which of the following is NOT a function of the animal nervous system?

Accepted Answer

Digesting food

Question 15

A scientist observes that a certain plant species only grows in nitrogen-poor soils. Which adaptation is most likely present in this plant?

Accepted Answer

Symbiotic relationship with nitrogen-fixing bacteria

Question 16

Which of the following best describes the difference between primary and secondary succession in ecology?

Accepted Answer

Primary succession occurs on newly formed land without soil, while secondary succession occurs in areas where soil remains after a disturbance.

Question 17

Which of the following is a correct statement about the structure and function of mitochondria?

Accepted Answer

Mitochondria generate ATP through cellular respiration.

Question 18

Which of the following is the best example of a keystone species in an ecosystem?

Accepted Answer

A predator that controls the population of herbivores, maintaining ecosystem balance.

Question 19

Which of the following is a correct interpretation of the competitive exclusion principle?

Accepted Answer

Two species competing for the same limited resource cannot coexist indefinitely.

Question 20

A student is analyzing a food web and notices that energy transfer between trophic levels is inefficient. What percentage of energy is typically transferred from one trophic level to the next?

Accepted Answer

About 10%

General Biology I: Course Syllabus and Study Guide

Guida di studio - Domande di pratica

Study guide - Flashcard