The functional unit of the kidney is the
a. renal pelvis.
b. ureter.
c. cortex.
d. nephron.
d
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Of the following, which is the least likely to be involved in cell-mediated immunity?
A) antibodies B) cytokines C) macrophages D) T cells
One disadvantage of hydroelectric energy as a renewable power source is that ____
a. it causes disease-causing organisms to remain in the stream b. it contributes to acid rain c. it produces greenhouse gases d. its dams block salmon from returning to streams to breed e. it pollutes streams downriver from the dams
What is separase?
A. A protein that is part of the cohesin complex. B. A protein that destroys cohesin through its protease activity. C. A protein that marks a protein called securin for destruction. D. A protein that targets the mitotic cyclin for degradation.
How do companion cells load most of the carbohydrates into sieve tube members?
a. by symport b. through carrier proteins c. through plasmodesmata d. by antiport