Nokea
Which process involves the movement of water molecules from an area of lower solute concentration to an area of higher solute concentration?
- A. Osmosis
- B. Facilitated diffusion
- C. Active transport
- D. Simple diffusion
Correct Answer: A
Rationale: Osmosis moves water across a membrane toward higher solute concentration.
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Regarding cartilage, which is true?
- A. they have a rich blood supply
- B. the intervertebral discs contain hyaline cartilage
- C. hyaline and fibrous cartilage never calcify
- D. elastic cartilage calcifies
Correct Answer: D
Rationale: Elastic cartilage can calcify, especially with age.
Spleen is called 'Grave yard' of
- A. WBC
- B. Platelets
- C. RBC
- D. Thrombocytes
Correct Answer: C
Rationale: The spleen is often referred to as the 'graveyard' of red blood cells (RBCs) because it removes old or damaged RBCs.
Gap junctions are important for:
- A. Preventing communication between cells
- B. Adhesion between adjacent cells
- C. Exchange of ions and small molecules between cells
- D. Mechanical support of tissues
Correct Answer: C
Rationale: Gap junctions allow direct exchange of ions and small molecules between adjacent cells.
What is the function of gap junctions in cell communication?
- A. Preventing communication between neighbouring cells
- B. Directly transferring electrical signals between cells
- C. Regulating the movement of large molecules
- D. Transporting oxygen across cell membranes
Correct Answer: B
Rationale: Gap junctions facilitate direct electrical signal transfer.
It is false that acids:
- A. increase hydrogen ion concentration in solution
- B. act as proton donors
- C. yield higher hydroxide concentration than hydrogen ion concentration
- D. have low pH
Correct Answer: C
Rationale: Acids increase H+ (low pH), not OH-, acting as proton donors.