In eukaryotic cells, where does the citric acid cycle occur?

a. In the mitochondria
b. In the cytoplasm
c. In the plasma membrane
d. In the central vacuole


a. In the mitochondria

In eukaryotic cells, the citric acid cycle occurs in the mitochondria.

Biology & Microbiology

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Clearly differentiate between the following terms: gross primary productivity and net primary

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What regulates the flow of water through the xylem?

a) the number of companion cells in the phloem b) passive transport by the endodermis c) the evaporation of water from the leaves d) active transport by sieve-tube members e) active transport by tracheid and vessel elements.

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Cytotoxic T-cells

A. lack specificity for a target cell. B. secrete interleukin-2 to stimulate B and T-cells. C. stimulate B-cell proliferation. D. secrete granzymes and perforins that damage target cells. E. All of these choices are correct.

Biology & Microbiology