Question 1

Which of the following best explains why water is considered a polar molecule?

Accepted Answer

Oxygen is more electronegative than hydrogen, resulting in an unequal sharing of electrons and partial charges on the molecule.

Question 2

Which property of water allows it to moderate Earth's climate by absorbing heat without a large increase in temperature?

Accepted Answer

High specific heat capacity

Question 3

A solution is prepared by dissolving 10 g of NaCl in 100 mL of water. Which term best describes NaCl in this scenario?

Accepted Answer

Solute

Question 4

Which equation correctly represents the dissociation of water?

Accepted Answer

$$H_2O \rightarrow H^+ + OH^-$$

Question 5

Which of the following statements about acids and bases is correct?

Accepted Answer

Acids increase the concentration of $$H^+$$ ions in solution.

Question 6

Which of the following is NOT one of the four major classes of macromolecules found in living organisms?

Accepted Answer

Vitamins

Question 7

Which type of chemical bond is primarily responsible for the secondary structure of proteins?

Accepted Answer

Hydrogen bonds

Question 8

A scientist discovers a molecule with a carboxyl group ($$-COOH$$), an amino group ($$-NH_2$), and a side chain. This molecule is most likely:

Accepted Answer

An amino acid

Question 9

Which of the following functional groups is found in both proteins and nucleic acids and is important for energy transfer?

Accepted Answer

Phosphate group ($$-PO_4$)

Question 10

Which process joins monomers to form polymers by removing a molecule of water?

Accepted Answer

Dehydration synthesis

Question 11

Which of the following statements about cell size is correct?

Accepted Answer

Cell size is limited by the surface area to volume ratio, which affects nutrient and waste exchange.

Question 12

Which organelle is responsible for producing ATP through cellular respiration in eukaryotic cells?

Accepted Answer

Mitochondrion

Question 13

Which of the following statements best describes the role of ribosomes in the cell?

Accepted Answer

Ribosomes are the site of protein synthesis, translating mRNA into polypeptides.

Question 14

Which of the following is a function of the cytoskeleton in eukaryotic cells?

Accepted Answer

Providing structural support and facilitating cell movement

Question 15

Which type of cell junction allows for direct communication between animal cells by permitting the passage of ions and small molecules?

Accepted Answer

Gap junctions

Question 16

Which of the following statements about phospholipids in the plasma membrane is correct?

Accepted Answer

Phospholipids arrange themselves so that the hydrophilic heads face outward toward the aqueous environment.

Question 17

Which of the following best describes the difference between saturated and unsaturated fatty acids?

Accepted Answer

Saturated fatty acids have no double bonds between carbon atoms; unsaturated fatty acids have one or more double bonds.

Question 18

Which of the following is a real-world example of a molecule whose shape influences its biological function?

Accepted Answer

Hemoglobin, whose quaternary structure allows it to bind oxygen efficiently in red blood cells.

Question 19

Which of the following statements about dehydration synthesis and hydrolysis is correct?

Accepted Answer

Dehydration synthesis joins monomers to form polymers by removing water; hydrolysis breaks polymers into monomers by adding water.

Question 20

A patient is diagnosed with a genetic disorder that affects the structure of collagen in connective tissue. Which level of protein structure is most likely disrupted?

Accepted Answer

Quaternary structure

General Biology Study Guide: The Chemical Context of Life, Cells, and Membrane Structure

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