Question 1

Which of the following best describes the difference between kinetic and potential energy in the context of human physiology?

Accepted Answer

Kinetic energy is the energy of movement, such as muscle contraction, while potential energy is stored energy, such as in chemical bonds of ATP.

Question 2

A patient is given a radioactive isotope for a PET scan. What property of the isotope makes it useful for this diagnostic procedure?

Accepted Answer

It is unstable and undergoes spontaneous decay, emitting detectable energy.

Question 3

Which of the following best explains why water is considered the 'universal solvent' in biological systems?

Accepted Answer

Water's polarity allows it to dissolve many ionic and polar substances, facilitating transport and reactions in the body.

Question 4

A solution has a pH of 4. Which of the following statements is correct regarding this solution?

Accepted Answer

It is acidic, with a high concentration of H$$^+$$ ions.

Question 5

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

Accepted Answer

They help regulate nerve and muscle function, acid-base balance, and fluid balance.

Question 6

A patient is experiencing muscle cramps and irregular heartbeat. Blood tests reveal low potassium (K$$^+) $$levels. Which compartment is most affected by this electrolyte imbalance?

Accepted Answer

Intracellular fluid, where potassium is the primary cation.

Question 7

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

Accepted Answer

Saturated fats have no double bonds and are solid at room temperature, while unsaturated fats have one or more double bonds and are liquid.

Question 8

Which of the following is a correct example of a decomposition reaction in the body?

Accepted Answer

The breakdown of glycogen into glucose during fasting.

Question 9

Which of the following statements about enzymes is correct?

Accepted Answer

Enzymes lower the activation energy required for a reaction to occur.

Question 10

A person is unable to produce sufficient insulin, a protein hormone. Which of the following is a direct consequence of this deficiency?

Accepted Answer

Impaired regulation of blood sugar levels.

Question 11

Which of the following best explains why ATP is considered the 'energy currency' of the cell?

Accepted Answer

ATP stores energy in its phosphate bonds, which can be released to power cellular processes.

Question 12

Which of the following is a property of water that is critical for maintaining body temperature during exercise?

Accepted Answer

High heat capacity, allowing the body to absorb and release large amounts of heat with little temperature change.

Question 13

A patient with chronic kidney disease is unable to excrete excess hydrogen ions (H$$^+). $$What is the likely effect on their blood pH?

Accepted Answer

Blood pH will decrease, leading to acidosis.

Question 14

Which of the following best describes the role of phospholipids in cell membranes?

Accepted Answer

They form a bilayer with hydrophilic heads facing outward and hydrophobic tails inward, creating a selective barrier.

Question 15

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

Accepted Answer

Nucleic acid – Nucleotide

Question 16

A person consumes a meal high in carbohydrates. Which process will their body use to store excess glucose, and what is the storage form?

Accepted Answer

Glycogenesis; glycogen

Question 17

Which of the following best explains why cholesterol is important in the human body?

Accepted Answer

It is a component of cell membranes and a precursor for steroid hormones.

Question 18

Which of the following statements about nucleic acids is correct?

Accepted Answer

DNA contains the instructions for protein synthesis and is found in the nucleus.

Question 19

A scientist is studying a molecule with the formula C$$_6H$_{12}O$_6. $$Which class of biological molecule does this represent, and what is its primary function?

Accepted Answer

Carbohydrate; quick energy source

Question 20

Which of the following best describes the function of buffers in the human body?

Accepted Answer

Buffers maintain pH homeostasis by minimizing changes in hydrogen ion concentration.

Biochemical Processes and Biological Molecules: Foundations for Anatomy & Physiology

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