Question 1

Which of the following best explains why cells are considered the structural and functional unit of life?

Accepted Answer

Cells are the smallest entities that can carry out all life processes, including metabolism, growth, and reproduction.

Question 2

Which of the following correctly compares the three domains of life?

Accepted Answer

Bacteria and Archaea are prokaryotic, while Eukarya are eukaryotic.

Question 3

Which of the following best illustrates the principle of emergent properties?

Accepted Answer

A functioning heart can pump blood, but individual heart cells cannot.

Question 4

In an ecosystem, how do the flow of energy and the cycling of nutrients differ?

Accepted Answer

Energy flows in one direction and is eventually lost as heat, while nutrients are recycled.

Question 5

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

Accepted Answer

Individuals with advantageous traits are more likely to survive and reproduce, passing those traits to the next generation.

Question 6

A scientist observes that a certain plant grows faster in sunlight than in shade. She hypothesizes that light increases the rate of photosynthesis. Which of the following is the best prediction based on her hypothesis?

Accepted Answer

If plants are exposed to more light, then their rate of photosynthesis will increase.

Question 7

Which of the following statements about the difference between a hypothesis and a prediction is correct?

Accepted Answer

A hypothesis is a testable explanation, while a prediction is a specific outcome expected if the hypothesis is correct.

Question 8

Which of the following best describes the role of a control group in an experiment?

Accepted Answer

It serves as a baseline for comparison to determine the effect of the experimental variable.

Question 9

Which of the following correctly describes the chromosomal contributions made by each parent during fertilization in humans?

Accepted Answer

Each parent contributes one haploid set of chromosomes, resulting in a diploid zygote.

Question 10

Which of the following events occurs during metaphase of mitosis?

Accepted Answer

Chromosomes align at the center (metaphase plate) of the cell.

Question 11

Which of the following best explains how nondisjunction during meiosis can result in Down syndrome?

Accepted Answer

Failure of homologous chromosomes to separate leads to a gamete with an extra chromosome 21, resulting in trisomy 21.

Question 12

Which of the following statements about the structure and function of the plasma membrane is correct?

Accepted Answer

The plasma membrane is selectively permeable, allowing some molecules to pass while restricting others.

Question 13

A red blood cell is placed in a hypotonic solution. What will most likely happen to the cell, and why?

Accepted Answer

Water will enter the cell by osmosis, causing it to swell and possibly burst.

Question 14

Which of the following best describes the difference between primary and secondary active transport across a biological membrane?

Accepted Answer

Primary active transport uses ATP directly, while secondary active transport uses the energy stored in an ion gradient.

Question 15

Which of the following equations correctly represents the overall reaction for cellular respiration?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$} + 6\ \mathrm{O_2$} ightarrow 6\ \mathrm{CO_2$} + 6\ \mathrm{H_2O} + 	ext{energy (ATP)}$$

Question 16

Which of the following best explains why enzymes are necessary for life?

Accepted Answer

Enzymes lower the activation energy of chemical reactions, allowing them to occur at body temperature.

Question 17

Which of the following statements about the structure of water is correct and explains its unique properties?

Accepted Answer

Water molecules are polar, with oxygen being more electronegative than hydrogen, leading to hydrogen bonding between molecules.

Question 18

Which of the following best describes the difference between a nonpolar covalent bond and a polar covalent bond?

Accepted Answer

In a nonpolar covalent bond, electrons are shared equally; in a polar covalent bond, electrons are shared unequally.

Question 19

Which of the following correctly identifies the components of a nucleotide?

Accepted Answer

A 5-carbon sugar, a nitrogenous base, and a phosphate group

Foundations of Biology: Life, Cells, Chemistry, and Cell Division

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