Question 1

Which of the following statements best explains why carbon atoms are considered the most versatile building blocks of biological molecules?

Accepted Answer

Carbon atoms have a valence of 4, allowing them to form single, double, and triple bonds with a variety of atoms.

Question 2

Which functional group is responsible for making molecules more hydrophobic and is considered non-polar?

Accepted Answer

Methyl group ($$-CH_3$)

Question 3

A scientist is studying a molecule that contains a carbon atom double bonded to an oxygen atom. Which functional group is present?

Accepted Answer

Carbonyl group ($$-C=O)$$

Question 4

Which functional group is critical in stabilizing protein structure through the formation of disulfide bridges?

Accepted Answer

Sulfhydryl group ($$-SH)$$

Question 5

During the formation of a polymer from monomers, which type of reaction occurs and what is released?

Accepted Answer

Dehydration synthesis; water is released

Question 6

Which of the following best describes a glycosidic linkage in a disaccharide?

Accepted Answer

A covalent bond formed by dehydration synthesis between two sugar monomers

Question 7

Which functional group acts as an acid because it can donate a proton ($$H^+) $$and is found in amino acids?

Accepted Answer

Carboxyl group ($$-COOH)$$

Question 8

A molecule contains a phosphate group. Which of the following is a property of this group?

Accepted Answer

It is polar and can act as an acid by donating protons.

Question 9

Which of the following is NOT a correct pairing of a functional group and its typical biological molecule?

Accepted Answer

Amino group ($$-NH_2$) — Lipids

Question 10

Which statement about monosaccharides is TRUE?

Accepted Answer

Monosaccharides can be joined to form disaccharides and polysaccharides via dehydration synthesis.

Question 11

Which of the following best describes the difference between hydrolysis and dehydration synthesis?

Accepted Answer

Hydrolysis breaks polymers by adding water, while dehydration synthesis forms polymers by removing water.

Question 12

A molecule with both an amino group and a carboxyl group is most likely to be:

Accepted Answer

An amino acid

Question 13

Which of the following is a correct chemical formula for glucose, a common monosaccharide?

Accepted Answer

$$C_6H_{12}O_6$

Question 14

Which functional group is found in alcohols and is involved in condensation and hydrolysis reactions?

Accepted Answer

Hydroxyl group ($$-OH)$$

Question 15

Which of the following molecules is an exception to the definition of organic molecules?

Accepted Answer

Carbon dioxide ($$CO_2)$$

Question 16

What is the main reason that subtle changes in the location of functional groups can have a significant impact on a molecule's chemical and functional characteristics?

Accepted Answer

Functional groups can alter the molecule's reactivity and interactions with other molecules.

Question 17

Which of the following is a correct example of a disaccharide and its monomer components?

Accepted Answer

Maltose: Glucose + Glucose

Question 18

A student mixes two monosaccharides in water and observes the formation of a covalent bond and the release of a water molecule. What type of reaction has occurred?

Accepted Answer

Dehydration synthesis

Question 19

Which functional group is similar to phosphoric acid and is important in cellular energy storage and transfer?

Accepted Answer

Phosphate group ($$-PO_4$)

Question 20

Which of the following statements about the general structure of carbohydrates is TRUE?

Accepted Answer

Each carbon atom in a carbohydrate has a hydroxyl group attached to it except one, which has a carbonyl group.

Biological Molecules: Structure, Function, and Types

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