With a light microscope, observation of which of the following would allow discrimination between a prokaryote and a eukarkyote?

a. the cell membrane
b. a nucleus
c. flagella
d. a cell wall


Ans: b. a nucleus

Biology & Microbiology

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Which of the following is a Gram-negative bacterium that acts as a predator on other Gram-negative bacteria, and might be used to control populations of Gram-negative human pathogens in locations such as poultry farms?

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All of the following are mechanisms of thermoregulation in ectothermic animals EXCEPT

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Local and long-distance signals in cells will trigger

changes in a. metabolism. b. gene expression. c. growth. d. development. e. any of these.

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How must spindle microtubules attach to chromosomes during prometaphase of meiosis I?

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Biology & Microbiology