Question 1

Which property of carbon atoms allows them to form the backbone of biological macromolecules?

Accepted Answer

Carbon atoms have a valence of 4, allowing them to form four covalent bonds.

Question 2

A molecule with the formula $$C_6H_{12}O_6$ can exist in both linear and ring forms. Which class of biomolecule does this represent?

Accepted Answer

Monosaccharide

Question 3

Which functional group is responsible for the polarity and hydrogen bonding capability of alcohols?

Accepted Answer

Hydroxyl group ($$-OH)$$

Question 4

Which of the following best explains why saturated fats are solid at room temperature while unsaturated fats are liquid?

Accepted Answer

Saturated fats have no double bonds, allowing tight packing; unsaturated fats have double bonds causing kinks and loose packing.

Question 5

Which chemical group is found in both aldehydes and ketones, and is important in sugars?

Accepted Answer

Carbonyl group ($$C=O)$$

Question 6

A patient is diagnosed with lactose intolerance. Which biological principle explains their inability to digest lactose?

Accepted Answer

The patient lacks the enzyme needed to hydrolyze the glycosidic bond in lactose.

Question 7

Which of the following is NOT a polymer?

Accepted Answer

Phospholipid

Question 8

Which statement best describes the role of epigenetic mechanisms in the brain?

Accepted Answer

Epigenetic mechanisms regulate gene expression without changing the DNA sequence, affecting memory and addiction.

Question 9

Which of the following best illustrates the diversity of carbon skeletons in organic molecules?

Accepted Answer

Carbon skeletons vary in length, branching, double bond position, and ring structure.

Question 10

Which of the following is a correct description of a phospholipid?

Accepted Answer

A molecule with a hydrophilic head and two hydrophobic tails.

Question 11

Which equation correctly represents the formation of a disaccharide from two monosaccharides via dehydration synthesis?

Accepted Answer

$$C_6H_{12}O_6$ + C_6H_{12}O_6$ \rightarrow C$$_{12}$$H_{22}O$$_{11} + H_2O$

Question 12

Which of the following is a function of cell biology research as described in the study materials?

Accepted Answer

To understand life, disease, and discover new medical therapies.

Question 13

Which of the following best describes a trans fat?

Accepted Answer

A fat produced by hydrogenating unsaturated fats, resulting in trans double bonds.

Question 14

Which chemical group is most likely to make a molecule acidic?

Accepted Answer

Carboxyl group ($$-COOH)$$

Question 15

A cow is treated with antibiotics. What is a likely consequence for its gut microbiome and digestion?

Accepted Answer

Antibiotics may reduce beneficial gut microbes, impairing digestion of complex carbohydrates.

Question 16

Which of the following is a correct comparison between polymers and lipids?

Accepted Answer

Polymers are made of repeating monomers; lipids are not true polymers.

Question 17

Which of the following is a direct result of the presence of double bonds in unsaturated fatty acids?

Accepted Answer

The fatty acid chains have kinks, preventing tight packing.

Question 18

Which of the following best describes the relationship between genome, epigenome, and environment in the context of memory formation?

Accepted Answer

The environment can influence the epigenome, which regulates gene expression from the genome, affecting memory formation.

Question 19

Which of the following is a correct statement about the molecular diversity of carbon compounds?

Accepted Answer

Carbon compounds can have varied skeletons including length, branching, double bonds, and rings.

Macromolecules: Carbon, Carbohydrates, and Lipids – Structure and Function in Cell Biology

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