All of the following occur in a countercurrent exchange EXCEPT

a. flow in opposite directions.
b. a concentration gradient.
c. a large surface area.
d. short contact time for exchange


D

Biology & Microbiology

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You are using genetic engineering to design a protein that needs to be synthesized in the cytoplasm and then localized in the nucleus of the cell. To accomplish this, one could add

A) a nuclear localization signal into the DNA that will be present in the mature protein. B) the compound during mitosis, at a time when the nuclear membrane is dispersed. C) a nucleotide or few nucleotides to the protein. D) a series of specific polysaccharides to the carboxyterminal end of the protein. E) all of the above

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The Indo-Pacific coral reefs have about ____ species of true corals to ____ in the Atlantic

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DNA is associated with RNA and certain proteins forming chromatin

__________________Indicate whether the statement is true or false.

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You will not observe __________ in animal cells.

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Biology & Microbiology