Question 1

Which of the following best describes the process of dehydration synthesis in the formation of biological polymers?

Accepted Answer

It involves the removal of a water molecule to join two monomers together.

Question 2

A patient is diagnosed with a genetic disorder that affects the formation of disulfide bonds in proteins. Which level of protein structure is most directly impacted by this defect?

Accepted Answer

Tertiary structure

Question 3

Which of the following functional groups is found in all amino acids and is responsible for their acidic properties?

Accepted Answer

Carboxyl group $$(-COOH)$$

Question 4

A triglyceride is formed from which combination of molecules?

Accepted Answer

One glycerol and three fatty acids

Question 5

Which of the following best explains why unsaturated fats are generally liquid at room temperature?

Accepted Answer

The presence of double bonds creates kinks, preventing tight packing of fatty acid chains.

Question 6

Which of the following is a correct chemical equation for the hydrolysis of sucrose?

Accepted Answer

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

Question 7

Which of the following statements about phospholipids is correct?

Accepted Answer

They have hydrophilic heads and hydrophobic tails, forming bilayers in water.

Question 8

A scientist is studying a molecule with the formula $$C_6H_{12}O_6$. Which class of biological molecule does this most likely represent?

Accepted Answer

Monosaccharide

Question 9

Which of the following is NOT a function of proteins in the human body?

Accepted Answer

Long-term energy storage

Question 10

Which of the following best describes the role of ATP in cellular metabolism?

Accepted Answer

It acts as the primary energy currency, releasing energy when hydrolyzed to ADP and $$P_i.$$

Question 11

A mutation causes a change in the R-group of an amino acid in a protein. Which property of the protein is most likely to be affected?

Accepted Answer

The protein's tertiary structure and function

Question 12

Which of the following best explains why cellulose cannot be digested by humans?

Accepted Answer

Humans lack the enzyme to break the specific glycosidic bonds in cellulose.

Question 13

Which of the following is a correct base pairing in DNA?

Accepted Answer

Adenine with Thymine

Question 14

A patient has a high LDL and low HDL cholesterol level. Which of the following is a likely health risk associated with this profile?

Accepted Answer

Increased risk of heart disease

Question 15

Which of the following is a function of carbohydrates in the body?

Accepted Answer

Providing energy for metabolism

Question 16

Which of the following best describes the difference between a saturated and an unsaturated fatty acid?

Accepted Answer

Saturated fatty acids have no double bonds between carbon atoms, while unsaturated fatty acids have at least one double bond.

Question 17

Which of the following is a component of a nucleotide?

Accepted Answer

A phosphate group, a five-carbon sugar, and a nitrogenous base

Question 18

Which of the following best explains the specificity of enzyme-substrate interactions?

Accepted Answer

The active site of the enzyme has a unique shape that fits only specific substrates (lock and key model).

Question 19

A student mixes glucose and fructose in a test tube and adds the enzyme sucrase. Which reaction will occur?

Accepted Answer

Dehydration synthesis to form sucrose and water

Question 20

Which of the following best describes the role of cholesterol in animal cell membranes?

Accepted Answer

It helps maintain membrane fluidity and stability.

Biological Molecules: Structure, Function, and Importance in Anatomy & Physiology

Guida di studio - Domande di pratica

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