Which of the following is correct concerning a spherical cell?

(A) As the diameter decreases, the surface area remains the same.
(B) As the diameter decreases, the surface area increases.
(C) As the diameter decreases, the surface-to-volume ratio increases.
(D) As the diameter increases, the volume decreases.
(E) The surface-to-volume ratio is independent of the diameter.


Ans: (C) As the diameter decreases, the surface-to-volume ratio increases.

Biology & Microbiology

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developmental events.

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During an action potential, the membrane potential ____

a. becomes more negative as sodium enters the cell b. becomes more negative as potassium leaves the cell c. becomes more positive as sodium enters the cell d. becomes more positive as sodium leaves the cell e. remains at -70 mV until threshold is reached

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In a negative feedback system, which one of the following statements is TRUE?

A) A sensor detects a stimulus, which in turn amplifies the original disturbance. B) Deviations from a desired condition are automatically detected and counteracted. C) Homeostasis cannot be re-established until the effector is turned off. D) The effector activates the sensor. E) A sensor is not needed because the body anticipates the coming change.

Biology & Microbiology

Potable water must be ________.

A. free of all elements B. free of pathogens C. sterile D. absolutely clear

Biology & Microbiology