Question 1

Which of the following best describes negative feedback in homeostasis?

Accepted Answer

A process where a change in a variable triggers mechanisms that oppose the change, restoring the variable to its set point.

Question 2

A patient is experiencing rapid blood loss. Which feedback mechanism is most likely to be activated to maintain blood pressure?

Accepted Answer

Negative feedback loop

Question 3

Which of the following is a correct example of antagonistic effectors in physiology?

Accepted Answer

Insulin and glucagon regulating blood glucose levels

Question 4

Which chemical bond is formed when electrons are shared between atoms?

Accepted Answer

Covalent bond

Question 5

A solution has a hydrogen ion concentration of $$1 	imes 10$$^{-5}$$ M. What is its pH?

Accepted Answer

$$5$$

Question 6

Which macromolecule is primarily responsible for catalyzing biochemical reactions in the body?

Accepted Answer

Proteins

Question 7

During dehydration synthesis, which of the following occurs?

Accepted Answer

A water molecule is removed to join two monomers.

Question 8

Which cytoskeletal component is most important for maintaining cell shape and resisting mechanical stress?

Accepted Answer

Intermediate filaments

Question 9

Which organelle is responsible for ATP production via oxidative phosphorylation?

Accepted Answer

Mitochondria

Question 10

Which process describes programmed cell death that is essential for normal development?

Accepted Answer

Apoptosis

Question 11

Which molecule is the primary carrier of genetic information in human cells?

Accepted Answer

DNA

Question 12

A mutation changes a single nucleotide in a gene, resulting in a different amino acid in the protein. What type of mutation is this?

Accepted Answer

Missense mutation

Question 13

Which of the following best describes the function of an enzyme's active site?

Accepted Answer

It binds to the substrate and catalyzes the reaction.

Question 14

Which equation represents the Michaelis-Menten relationship for enzyme kinetics?

Accepted Answer

$$v = \frac{V_{max} [S]}{K_m + [S]}$$

Question 15

Which of the following best describes competitive inhibition?

Accepted Answer

The inhibitor binds to the active site, preventing substrate binding.

Question 16

Which process produces the most ATP per glucose molecule?

Accepted Answer

Electron transport chain and oxidative phosphorylation

Question 17

A cell is placed in a solution with a higher concentration of non-penetrating solutes than inside the cell. What will happen to the cell?

Accepted Answer

It will shrink due to water efflux.

Question 18

Which equation is used to calculate absorbance in spectrophotometry according to Beer's Law?

Accepted Answer

$$A = \epsilon \cdot l \cdot c$$

Question 19

Which membrane transport process requires energy directly from ATP hydrolysis?

Accepted Answer

Primary active transport

Question 20

A scientist wants to prepare a 1 M solution of glucose ($$C_6H_{12}O_6$) in 1 L of water. The molar mass of glucose is 180$ g/mol. How many grams of glucose are needed?

Accepted Answer

$$180 g$$

Principles of Human Physiology: Exam 1 Study Guide

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