Question 1

Which of the following best explains why water has a high specific heat capacity compared to most other substances?

Accepted Answer

Hydrogen bonds between water molecules absorb heat when they break and release heat when they form, buffering temperature changes.

Question 2

A scientist is studying a molecule that contains carbon, hydrogen, and oxygen in a 1:2:1 ratio. Which class of macromolecule does this molecule most likely belong to?

Accepted Answer

Carbohydrate

Question 3

Which of the following statements about covalent and ionic bonds is correct?

Accepted Answer

Covalent bonds involve the sharing of electrons between atoms, while ionic bonds involve the transfer of electrons from one atom to another.

Question 4

Which property of water is most directly responsible for the ability of some insects to walk on water?

Accepted Answer

Cohesion due to hydrogen bonding

Question 5

A dehydration synthesis reaction is best described as:

Accepted Answer

A reaction that builds polymers from monomers by removing a molecule of water.

Question 6

Which of the following best explains why hydrocarbons are generally insoluble in water?

Accepted Answer

Hydrocarbons are nonpolar and cannot form hydrogen bonds with water.

Question 7

A patient is diagnosed with a genetic disorder that affects the formation of glycosidic bonds. Which type of macromolecule synthesis is most likely impaired?

Accepted Answer

Carbohydrate synthesis

Question 8

Which of the following functional groups is most likely to make a molecule more hydrophilic?

Accepted Answer

Hydroxyl group ($$-OH)$$

Question 9

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

Accepted Answer

Unsaturated fatty acids have one or more double bonds between carbon atoms, causing kinks in the chain.

Question 10

Which of the following equations correctly represents the hydrolysis of a disaccharide?

Accepted Answer

$$C_{12}H$$_{22}$$O_{11} + H_2O \rightarrow 2C_6H_{12}O_6$

Question 11

A DNA molecule contains 30% adenine. According to Chargaff's rules, what percentage of guanine would you expect to find?

Accepted Answer

20%

Question 12

Which of the following best explains why ice floats on liquid water?

Accepted Answer

Hydrogen bonds in ice create a lattice structure that is less dense than liquid water.

Question 13

Which of the following is a correct statement about the structure of proteins?

Accepted Answer

Proteins are polymers of amino acids linked by peptide bonds.

Question 14

A researcher adds a drop of oil to a beaker of water. The oil does not dissolve. Which property of the oil is responsible for this observation?

Accepted Answer

The oil is nonpolar and hydrophobic.

Question 15

Which of the following best describes the role of functional groups in organic molecules?

Accepted Answer

Functional groups give molecules specific chemical properties and reactivity.

Question 16

Which of the following best explains why water is an excellent solvent for many biological molecules?

Accepted Answer

Water is polar and can form hydrogen bonds with other polar molecules and ions.

Question 17

A student is asked to identify the type of bond formed between sodium and chlorine in table salt. Which answer is correct?

Accepted Answer

Ionic bond

Question 18

Which of the following is a correct description of a polymer and its corresponding monomer?

Accepted Answer

Nucleic acid: nucleotide

Question 19

Which of the following best describes the process of evaporative cooling in living organisms?

Accepted Answer

As water evaporates, it absorbs heat energy from the organism, lowering body temperature.

Question 20

Which of the following best explains the polarity of a water molecule?

Accepted Answer

Oxygen is more electronegative than hydrogen, resulting in an unequal sharing of electrons.

General Biology: Chemistry of Life, Water, Carbon, Macromolecules, and Biological Reactions

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