Why is the mature erythrocyte unable to synthesize proteins or lipids?

a. It has no nucleus.
b. It has no ribonucleic acid (RNA).
c. It cannot generate adenosine triphosphate (ATP).
d. Carrying oxygen interferes with synthesis.


ANS: A
The mature red cell no longer has a nucleus, mitochondria, and other organelles. It is therefore unable to synthesize proteins or lipids. It also cannot perform oxidative phosphorylation.

Health Professions

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What two directions can the distal tip of a flexible bronchoscope be flexed?

a. Up to 90 degree in ante-flexion and up to 30 degree in retro-flexion positions b. Up to 270 degree in ante-flexion and up to 220 degree in retro-flexion positions c. Up to 180 degree in ante-flexion and up to 90 degree in retro-flexion positions d. Up to 180 degree in ante-flexion and up to 130 degree in retro-flexion positions

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