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
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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
The Indo-Pacific coral reefs have about ____ species of true corals to ____ in the Atlantic
a. 100 to 35 b. 500 to 62 c. 350 to 25 d. 62 to 500 e. 1000 to 62
DNA is associated with RNA and certain proteins forming chromatin
__________________Indicate whether the statement is true or false.
You will not observe __________ in animal cells.
A) mitochondria B) a plasma membrane C) ribosomes D) a cell wall