Nokea
Secretions onto body surfaces are characteristic of __________ glands.
- A. Exocrine
- B. Matrix
- C. Histology
- D. Pathologist
Correct Answer: A
Rationale: Exocrine glands secrete onto surfaces.
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The main structural molecule of the plasma membrane is:
- A. carbohydrates
- B. cholesterol
- C. proteins
- D. phospholipids
Correct Answer: D
Rationale: Phospholipids form the bilayer, the primary structural component of the plasma membrane.
A solution with a pH of 3 would be:
- A. acidic
- B. basic
- C. neutral
Correct Answer: A
Rationale: pH < 7 indicates an acidic solution (high H+ concentration).
Which organelle and function is correctly matched?
- A. Smooth ER - makes proteins
- B. Peroxisomes - produce ATP
- C. Golgi apparatus - processing and packaging materials
- D. Ribosomes - movement by the cell
Correct Answer: C
Rationale: The Golgi apparatus processes and packages materials; other matches are incorrect.
One of the functions of integral proteins in cell membranes is to:
- A. maintain the rigid structure of the cell
- B. support mechanically the phospholipids
- C. interact with the cytoplasm
- D. form channels for transport functions
Correct Answer: D
Rationale: Some proteins form channels which allow molecules and ions to enter the cell.
The cell membranes in skeletal muscle
- A. Are impermeable to fat-soluble substances.
- B. Are more permeable to sodium than to potassium ions.
- C. Become more permeable to glucose in the presence of insulin.
- D. Become less permeable to potassium in the presence of insulin.
Correct Answer: C
Rationale: Insulin increases glucose uptake by facilitating transporter movement to the muscle cell membrane.