Q: A patient presents with a genetic disorder affecting the sodium-potassium pump. Which equation best describes the normal function of this pump?

$$3 \mathrm{Na}^+_{\text{out}} : 2 \mathrm{K}^+_{\text{in}}$$

Question 1

Which of the following best describes the difference between negative and positive feedback systems in human physiology?

Accepted Answer

Negative feedback reduces the original stimulus, while positive feedback amplifies it.

Question 2

A patient is experiencing dehydration after excessive sweating. Which type of gland is primarily responsible for this fluid loss, and what is the main component of its secretion?

Accepted Answer

Eccrine gland; watery solution of electrolytes

Question 3

Which equation correctly represents the relationship between atomic number ($$Z$$), mass number ($$A$$), and number of neutrons ($$N) in an $$atom?

Accepted Answer

$$A = Z + N$$

Question 4

During protein synthesis, which process involves the conversion of mRNA into a polypeptide chain, and where does this occur?

Accepted Answer

Translation; cytoplasm (ribosome)

Question 5

A patient with a third-degree burn is at risk for which of the following complications due to the loss of the epidermis and dermis?

Accepted Answer

Increased risk of dehydration and infection

Question 6

Which of the following best explains why enzymes lower the activation energy of chemical reactions?

Accepted Answer

Enzymes provide an alternative reaction pathway with a lower activation energy.

Question 7

Which type of active transport directly uses ATP to move ions against their concentration gradient?

Accepted Answer

Primary active transport

Question 8

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

Accepted Answer

The cell will shrink due to osmosis.

Question 9

Which phase of mitosis is characterized by the alignment of chromosomes along the center of the cell?

Accepted Answer

Metaphase

Question 10

Which of the following is a function of the Golgi apparatus in a eukaryotic cell?

Accepted Answer

Modification and packaging of proteins

Question 11

A patient presents with a genetic disorder affecting the sodium-potassium pump. Which equation best describes the normal function of this pump?

Accepted Answer

$$3 \mathrm{Na}^+_{	ext{out}} : 2 \mathrm{K}^+_{	ext{in}}$$

Question 12

Which of the following best describes the role of tRNA during translation?

Accepted Answer

tRNA carries amino acids to the ribosome and matches them to the mRNA codon.

Question 13

Which of the following is NOT a function of the skin?

Accepted Answer

Production of red blood cells

Question 14

A patient with a mutation in the gene coding for collagen would most likely have problems with which tissue?

Accepted Answer

Connective tissue

Question 15

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

Accepted Answer

DNA is double-stranded, while RNA is single-stranded.

Question 16

Which of the following is a real-life example of negative feedback in the human body?

Accepted Answer

Regulation of blood glucose by insulin

Question 17

Which of the following best explains why third-degree burns are usually not painful?

Accepted Answer

The burn destroys nerve endings in the affected area.

Question 18

Which of the following best describes the function of mitochondria in eukaryotic cells?

Accepted Answer

Energy production through cellular respiration

Question 19

A patient is diagnosed with a disorder affecting the epidermis. Which of the following is a function of the epidermis?

Accepted Answer

Production of melanin

Question 20

Which of the following best describes the process of osmosis?

Accepted Answer

Movement of water from an area of low solute concentration to high solute concentration across a semipermeable membrane.

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