During cellular maturation, mammalian erythrocytes lose their

A. nucleus.
B. plasma membrane.
C. mitochondria.
D. hemoglobin.
E. None of the answers for this question are correct.


A. nucleus.

Biology & Microbiology

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Based on his experiences while aboard the H.M.S. Beagle, Darwin realized that ____ provided the only plausible

explanation for his observations.

a. descent with modification b. a metaphysical perfecting principle c. the principle of use and disuse d. catastrophes in ancient environments e. inheritance of acquired characteristics

Biology & Microbiology

All mRNA transcripts begin with

a. methionine. b. a ribosome. c. AUG. d. the P site. e. an anticodon.

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________ Manual of Systematic Bacteriology is a manual of bacterial descriptions and classifications.

Fill in the blank(s) with the appropriate word(s).

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The differentiating mechanism between a flagellar response to a chemoattractant or a chemorepellent involves the ________ activity being low or high (respectively) on ________

a. autophosphorylation / CheA b. autophosphorylation / MCPs c. demethylation / CheA d. demethylation / MCPs

Biology & Microbiology