The concentration of calcium in a cell is 3%. The concentration of calcium in the surrounding fluid is 1%. How could the cell obtain more calcium?
a. passive transport
b. diffusion
c. active transport
d. osmosis
Ans: c. active transport
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Which of the following is NOT true of the glucocorticoid receptor?
A. The receptor contains a nuclear localization signal (NLS). B. When bound to glucocorticoids, the receptors will bind covalently and irreversibly to each other to form dimers. C. Glucocorticoid receptor dimers bind glucocorticoid response elements (GREs). D. Binding of glucocorticoid receptor dimers to GREs activates the transcription of the adjacent gene. E. The receptor contains a binding domain for glucocorticoids.
Which organ system includes the spleen, lymph nodes, and thymus?
a. circulatory system b. endocrine system c. nervous system d. digestive system e. lymphatic system
Gas exchange between the blood and interstitial fluid occurs via ____
a. diffusion b. active transport c. passive transport d. endocytosis e. pressure flow
Two true-breeding mutant strains of Drosophila have black body color instead of the wild-type gray yellow. When the two strains are crossed, all the F1 flies have wild-type body color. How can these data be interpreted?
A) Recombination occurred. B) Complementation occurred. C) The mutations involved are on two different genes. D) A new mutation occurred in all the offspring. E) Both B and C