Q: Which organelle is responsible for synthesizing proteins that are exported from the cell, and what is the pathway for protein secretion?

Rough endoplasmic reticulum; $$\text{RER} \rightarrow \text{Golgi body} \rightarrow \text{Vesicle} \rightarrow \text{Plasma membrane}$$

Question 1

Which statement best illustrates the principle of complementarity of structure and function in human anatomy and physiology?

Accepted Answer

The thin walls of alveoli in the lungs allow for efficient gas exchange.

Question 2

A patient presents with a dangerously low blood pH of 6.8. Which buffer system is most likely to help restore homeostasis, and what is the general equation for a buffer reaction?

Accepted Answer

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

Question 3

Which organ system is primarily responsible for removing metabolic wastes from the blood and regulating water balance?

Accepted Answer

Urinary system

Question 4

A cell is placed in a solution with a higher concentration of solutes than the cytoplasm. Which transport process will occur, and what is the expected result?

Accepted Answer

Osmosis; water will move out of the cell, causing it to shrink.

Question 5

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

Accepted Answer

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

Question 6

During vigorous exercise, muscle cells use ATP rapidly. Which equation represents the hydrolysis of ATP, and what is the primary function of ATP in cells?

Accepted Answer

ATP hydrolysis: $$\mathrm{ATP + H_2O \rightarrow ADP + P_i + energy}$$; ATP provides energy for cellular work.

Question 7

Which type of chemical bond is formed when electrons are shared unequally between atoms, resulting in a molecule with partial charges?

Accepted Answer

Polar covalent bond

Question 8

A patient with diabetes mellitus is experiencing homeostatic imbalance. Which feedback mechanism is most likely impaired, and what are its components?

Accepted Answer

Negative feedback; receptor, control center, effector

Question 9

Which organelle is responsible for synthesizing proteins that are exported from the cell, and what is the pathway for protein secretion?

Accepted Answer

Rough endoplasmic reticulum; $$	ext{RER} ightarrow 	ext{Golgi body} ightarrow 	ext{Vesicle} ightarrow 	ext{Plasma membrane}$$

Question 10

Which phase of the cell cycle is characterized by DNA replication, and what is the purpose of mitosis?

Accepted Answer

S phase; mitosis produces two identical daughter cells for growth and repair

Question 11

Which of the following best describes the function of peroxisomes in a liver cell?

Accepted Answer

Break down fatty acids and detoxify harmful substances

Question 12

A red blood cell is placed in pure water. Which process occurs, and what is the likely outcome?

Accepted Answer

Osmosis; the cell will swell and may burst

Question 13

Which of the following is a correct description of the anatomical position?

Accepted Answer

Standing upright, facing forward, arms at sides, palms facing forward

Question 14

Which of the following best describes the difference between tight junctions, desmosomes, and gap junctions?

Accepted Answer

Tight junctions prevent leakage; desmosomes anchor cells together; gap junctions allow communication between cells.

Question 15

Which equation represents the decomposition reaction of hydrogen peroxide in peroxisomes, and what is the biological significance?

Accepted Answer

Decomposition: $$\mathrm{2H_2O_2 \rightarrow 2H_2O + O_2$}$$; it protects cells from oxidative damage.

Question 16

Which of the following is NOT a major function of the cytoskeleton?

Accepted Answer

Synthesizing proteins

Question 17

Which process is responsible for the uptake of large particles, such as bacteria, by white blood cells, and what is the name of this process?

Accepted Answer

Phagocytosis; cell eating

Question 18

Which of the following best describes the role of enzymes in chemical reactions, and what is the general equation for an enzyme-catalyzed reaction?

Accepted Answer

Enzymes lower activation energy; $$\mathrm{E + S \rightarrow ES \rightarrow E + P}$$

Question 19

Which of the following is the correct order of structural organization in the human body, starting from the smallest unit?

Accepted Answer

Atom $$\rightarrow$$ Molecule $$\rightarrow$$ Cell $$\rightarrow$$ Tissue $$\rightarrow$$ Organ $$\rightarrow$$ Organ system $$\rightarrow$$ Organism

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