Which one of the following best defines differentiation?
A) the process of gradual structural and functional specialization of daughter cells
B) cell growth
C) fertilization of ovum by sperm
D) maintenance of homeostasis at cellular level
E) coordinated action of different cells
Answer: A
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Opening a bottle of perfume releases perfume molecules from the container, and within a few minutes the perfume can be smelled by a person many feet away from the bottle. This illustrates
A) diffusion. B) facilitated diffusion. C) osmosis. D) filtration. E) active transport.
Label C represents which of the following structures?
A) hilum
B) renal pelvis
C) renal cortex
D) renal medulla
E) renal sinus
The sodium-potassium pump helps to maintain the concentration gradients for sodium and potassium ions across the plasma membrane. Select the true statement regarding the sodium-potassium pump.
A)For each molecule of ATP used, the pump moves two negatively charged potassium ions out of the cell. B)For each molecule of ATP used, the pump moves three positively charged sodium ions out of the cell. C)For each molecule of ATP used, the pump moves three positively charged potassium ions out of the cell. D)For each molecule of ATP used, the pump moves two negatively charged sodium ions into the cell.
Which of the following is NOT an enzyme capable of destroying foreign bacteria?
A) pepsin B) fibrin C) lysozyme D) lipase