Question 1

Which of the following best describes the difference between negative and positive feedback mechanisms in the human body?

Accepted Answer

Negative feedback reduces the effect of the stimulus to maintain homeostasis, while positive feedback increases the effect of the stimulus, often leading to a specific outcome.

Question 2

A patient presents with a blood pH of 7.1. Which buffer system is most likely to be involved in restoring normal pH, and what is the main chemical reaction?

Accepted Answer

Bicarbonate buffer system; $$\mathrm{CO_2$ + H_2O \leftrightarrow H_2CO_3 \leftrightarrow $$HCO_3$$^- + H^+}$$

Question 3

Which of the following best explains why the sodium-potassium pump is considered an example of active transport?

Accepted Answer

It requires ATP to move sodium and potassium ions against their concentration gradients.

Question 4

Which organelle is primarily responsible for protein synthesis, and what are the two main processes involved?

Accepted Answer

Ribosome; transcription and translation

Question 5

A cell is placed in a hypertonic solution. What will happen to the cell, and why?

Accepted Answer

The cell will shrink because water moves out of the cell.

Question 6

Which of the following best describes the difference between DNA and RNA?

Accepted Answer

DNA is double-stranded and stores genetic information, while RNA is single-stranded and involved in protein synthesis.

Question 7

Which of the following is a correct example of a monomer and its corresponding polymer?

Accepted Answer

Nucleotide and DNA

Question 8

A patient has a mutation in the gene coding for collagen. Which tissue type is most likely to be affected?

Accepted Answer

Connective tissue

Question 9

Which of the following best describes the function of the serous membranes in the body?

Accepted Answer

They line body cavities and reduce friction between organs by secreting serous fluid.

Question 10

Which of the following best explains the difference between endocytosis and exocytosis?

Accepted Answer

Endocytosis brings substances into the cell by engulfing them, while exocytosis releases substances from the cell.

Question 11

A patient is diagnosed with osteoporosis. Which bone cell type is most likely overactive, and what is its function?

Accepted Answer

Osteoclast; bone resorption

Question 12

Which of the following best describes the difference between axial and appendicular skeletons?

Accepted Answer

Axial skeleton consists of the skull, vertebral column, and thoracic cage, while appendicular skeleton consists of the limbs and girdles.

Question 13

Which of the following is a correct description of the process of transcription?

Accepted Answer

Transcription is the process of synthesizing mRNA from a DNA template.

Question 14

A patient has a burn that affects the epidermis and part of the dermis. Which type of burn is this, and what is a common symptom?

Accepted Answer

Second-degree burn; blistering

Question 15

Which of the following best describes the difference between solution, solvent, and solute?

Accepted Answer

Solvent is the substance that dissolves the solute to form a solution.

Question 16

Which of the following best explains the difference between longitudinal and appositional bone growth?

Accepted Answer

Longitudinal growth increases bone length, while appositional growth increases bone width.

Question 17

Which of the following is a correct example of a reactant and product in cellular respiration?

Accepted Answer

Reactant: $$\mathrm{C_6H_{12}O_6$}$$; Product: $$\mathrm{CO_2$}$$

Question 18

A patient has a genetic disorder affecting the centromere of chromosomes. Which cellular process is most likely to be disrupted?

Accepted Answer

Cell division (mitosis and meiosis)

Question 19

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

Accepted Answer

Buffers help maintain pH balance by neutralizing excess acids or bases.

Question 20

A patient is unable to produce ATP efficiently due to a mitochondrial disorder. Which cellular process will be most directly affected?

Accepted Answer

Active transport

Comprehensive Study Guide: Anatomy & Physiology Core Concepts

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