Question 1

Which vitamin is primarily produced in the skin upon exposure to sunlight, and what is its main physiological role?

Accepted Answer

Vitamin D; it regulates calcium and phosphate metabolism.

Question 2

Which of the following are the building blocks of lipids, carbohydrates, and proteins, respectively?

Accepted Answer

Fatty acids, monosaccharides, amino acids

Question 3

What is the primary function of hydrogen bonds in water molecules?

Accepted Answer

They create surface tension and allow water to act as a solvent.

Question 4

Which statement best describes enzymes?

Accepted Answer

Enzymes are biological catalysts that speed up chemical reactions without being consumed.

Question 5

How do electrons organize themselves in an atom, and where are they found?

Accepted Answer

Electrons are arranged in energy levels (shells) around the nucleus.

Question 6

A patient is diagnosed with rickets, a disease characterized by weak bones. Which vitamin deficiency is most likely responsible, and what is the biochemical reason?

Accepted Answer

Vitamin D; it is required for calcium absorption in the intestines.

Question 7

Which equation correctly represents the formation of a peptide bond between two amino acids?

Accepted Answer

$$\mathrm{Amino\ acid}_1 + \mathrm{Amino\ acid}_2 \rightarrow \mathrm{Dipeptide} + H_2O$$

Question 8

Which property of water is MOST directly due to hydrogen bonding?

Accepted Answer

High specific heat capacity

Question 9

Which of the following best explains why enzymes are highly specific for their substrates?

Accepted Answer

The active site of an enzyme has a unique shape that fits only specific substrates.

Question 10

A mutation causes a change in the primary structure of a protein. Which level of protein structure is directly affected first?

Accepted Answer

Primary structure

Question 11

Which of the following is a correct description of the electron configuration for a neutral oxygen atom?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^4$$

Question 12

Which process is catalyzed by enzymes in the digestive system to break down carbohydrates?

Accepted Answer

Hydrolysis

Question 13

Which of the following is a real-life example of hydrogen bonding in biological systems?

Accepted Answer

The double helix structure of DNA is stabilized by hydrogen bonds between base pairs.

Question 14

If a cell is placed in pure water, what will happen to the cell and why?

Accepted Answer

Water will enter the cell by osmosis, causing it to swell.

Question 15

Which of the following best describes the role of enzymes in metabolic pathways?

Accepted Answer

Enzymes lower the activation energy, allowing reactions to proceed faster.

Question 16

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

Accepted Answer

$$C_6H_{12}O_6$

Question 17

Which statement best explains why lipids are insoluble in water?

Accepted Answer

Lipids are nonpolar molecules, while water is polar.

Question 18

Which of the following is a function of proteins in the human body?

Accepted Answer

Catalyzing biochemical reactions as enzymes

Question 19

Which of the following best describes the relationship between enzyme activity and temperature?

Accepted Answer

Enzyme activity increases with temperature up to an optimum, then decreases due to denaturation.

Question 20

Which of the following is a correct statement about the location of electrons in an atom?

Accepted Answer

Electrons are found in orbitals surrounding the nucleus.

Fundamental Biochemistry Concepts for Anatomy & Physiology

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