Question 1

Which property of carbon allows it to form large, complex, and diverse molecules essential for life?

Accepted Answer

Carbon has four valence electrons, allowing it to form up to four covalent bonds.

Question 2

Which of the following best describes an isomer?

Accepted Answer

Molecules with the same chemical formula but different structures.

Question 3

Which chemical group is nonpolar and hydrophobic, and is often found in lipids?

Accepted Answer

Methyl group ($$-CH_3$)

Question 4

Which process is responsible for linking monomers together to form polymers, and what is the byproduct?

Accepted Answer

Dehydration synthesis; water is released

Question 5

A biochemist discovers a new carbohydrate composed of four pentoses and one hexose. What is the most likely chemical formula for this molecule?

Accepted Answer

$$C_{26}H$$_{44}$$O_{22}$

Question 6

Which of the following statements about starch and cellulose is correct?

Accepted Answer

Both are composed of glucose monomers, but only starch can be digested by humans for energy.

Question 7

Which of the following best explains why lipids are hydrophobic?

Accepted Answer

Their hydrocarbon chains are nonpolar and do not interact with water.

Question 8

Which type of lipid is the main component of cell membranes, and what unique property does it have?

Accepted Answer

Phospholipids; they have both hydrophilic and hydrophobic regions

Question 9

Which of the following is NOT a function of proteins?

Accepted Answer

Storing genetic information

Question 10

Which level of protein structure is primarily determined by the sequence of amino acids?

Accepted Answer

Primary structure

Question 11

What is the relationship between monomers and polymers?

Accepted Answer

Polymers are large molecules made by joining together many monomers.

Question 12

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

Accepted Answer

Unsaturated fatty acids have double bonds, causing kinks in the chain, while saturated fatty acids have only single bonds.

Question 13

Which of the following functional groups is found in all amino acids?

Accepted Answer

Carboxyl group ($$-COOH)$$

Question 14

Which process breaks down polymers into monomers by adding water?

Accepted Answer

Hydrolysis

Question 15

Which of the following is a correct pairing of a macromolecule and its monomer?

Accepted Answer

Carbohydrate – monosaccharide

Question 16

Which of the following statements about nucleic acids is true?

Accepted Answer

DNA contains the nitrogenous bases adenine, thymine, guanine, and cytosine.

Question 17

A protein loses its shape due to high temperature or pH changes. What is this process called, and why is it significant?

Accepted Answer

Denaturation; it disrupts the protein's function by altering its shape.

Question 18

Which of the following best explains why glucose and fructose, both with the formula $$C_6H_{12}O_6$, have different properties?

Accepted Answer

They are isomers with different arrangements of atoms.

Question 19

Which of the following is a real-life example of the importance of isomers in biology?

Accepted Answer

Methamphetamine exists as two isomers, one used as a drug and one as a nasal decongestant.

Question 20

Which of the following best describes the role of R-groups in protein structure?

Accepted Answer

R-groups interact to stabilize the tertiary structure of proteins.

The Molecules of Cells: Structure and Function of Biological Macromolecules

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