Where does most new membrane synthesis take place in a eukaryotic cell?
(a) in the Golgi apparatus
(b) in the endoplasmic reticulum
(c) in the plasma membrane
(d) in the mitochondria
(e) on ribosomes
(b)
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The process by which a single primary RNA transcript is used to make multiple proteins is called:
A. combinatorial control. B. alternative splicing. C. regulatory splicing. D. translational control. E. polymeration control.
What sirenian went extinct just 27 years after its discovery?
a. Brazilian manatee b. African manatee c. Stellar sea cow d. Dugong
Narrowing of the arterial lumen due to buildup of lipids is:
a. atrial fibrillation b. atherosclerosis c. a blood clot d. arrhythmia e. angioplasty
Suppose that the cells of seed plants, like the skin cells of humans, produce a pigment upon increased exposure to ultraviolet radiation. Rank the following cells, from greatest to least, in terms of the likelihood of producing this pigment
1. cells of sporangium 2. cells in the interior of a subterranean root 3. epidermal cells of sporophyte megaphylls 4. cells of a gametophyte A) 3, 4, 1, 2 B) 3, 4, 2, 1 C) 3, 1, 4, 2 D) 3, 2, 1, 4