Question 1

Which property of water is primarily responsible for the ability of some insects to walk on the surface of a pond without sinking?

Accepted Answer

Surface tension due to hydrogen bonding

Question 2

A scientist is studying a cell that has a very high surface area-to-volume ratio. Which of the following is most likely true about this cell?

Accepted Answer

It is a small cell optimized for efficient exchange of materials with its environment.

Question 3

Which of the following best explains why phospholipids form a bilayer in aqueous environments?

Accepted Answer

Their hydrophilic heads interact with water, while hydrophobic tails avoid water.

Question 4

A freshwater Paramecium is placed in a hypertonic salt solution. What is the most likely outcome for the Paramecium?

Accepted Answer

It will shrivel as water leaves the cell by osmosis.

Question 5

Which of the following is a direct result of the endosymbiotic origin of mitochondria?

Accepted Answer

Mitochondria contain their own circular DNA and reproduce independently within the cell.

Question 6

Which equation correctly represents the solute potential ($$\Psi_s) of a $$solution?

Accepted Answer

$$\Psi_s = -iCRT$$

Question 7

A mutation changes a single amino acid in the active site of an enzyme. Which is the most likely effect?

Accepted Answer

The enzyme may lose its ability to bind the substrate, reducing or eliminating its activity.

Question 8

Which process is responsible for the movement of oxygen ($$O_2) $$from the alveoli of the lungs into the blood capillaries?

Accepted Answer

Simple diffusion

Question 9

Which of the following best describes the flow of genetic information in a retrovirus?

Accepted Answer

RNA $$\rightarrow$$ DNA $$\rightarrow$$ protein

Question 10

A population of beetles has the following allele frequencies: $$p = 0.7$$ for the dominant allele and $$q = 0.3$$ for the recessive allele. According to Hardy-Weinberg equilibrium, what is the expected frequency of heterozygotes in the population?

Accepted Answer

$$2pq = 0.42$$

Question 11

Which of the following is an example of convergent evolution?

Accepted Answer

The wings of birds and insects, which evolved independently for flight.

Question 12

Which of the following best explains why DNA replication is described as 'semiconservative'?

Accepted Answer

Each new DNA molecule consists of one parental and one newly synthesized strand.

Question 13

A cell is placed in a solution with a water potential ($$\Psi) of$$ $$-0.5$$ bars. The cell's internal water potential is $$-0.3$$ bars. What will happen to the cell?

Accepted Answer

Water will move out of the cell.

Question 14

Which of the following best describes the role of the Golgi complex in eukaryotic cells?

Accepted Answer

It modifies, folds, and packages proteins for secretion or delivery to other organelles.

Question 15

Which of the following is a direct consequence of a population experiencing a genetic bottleneck?

Accepted Answer

Reduced genetic diversity and increased susceptibility to environmental changes

Question 16

Which of the following best describes the function of tRNA during translation?

Accepted Answer

It brings specific amino acids to the ribosome based on the mRNA codon.

Question 17

Which of the following is true regarding the inheritance of mitochondrial DNA in humans?

Accepted Answer

It is inherited exclusively from the mother.

Question 18

Which of the following best explains why increasing substrate concentration increases the rate of an enzyme-catalyzed reaction only up to a certain point?

Accepted Answer

All enzyme active sites become occupied, so the reaction rate levels off.

Question 19

Which of the following is a correct formula for the surface area of a sphere?

Accepted Answer

$$SA = 4\pi r^2$

Comprehensive Study Notes: Foundations of College Biology

Study Guide - Practice Questions

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