Cell plate formation
(a) occurs in plant cells but not in animal cells.
(b) usually begins during telophase.
(c) is a result of fusion of Golgi vesicles.
(d) is all of the above.
(d) is all of the above.
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When an atom or molecule gains one or more electrons, it is said to be:
A. energized. B. oxidized. C. polarized. D. reduced.
Robert Koch and his colleagues first used agar in bacteriological media. Why was this ingredient an improvement on previous materials used to culture bacteria?
A. Bacteria growing on the solidified medium did not degrade or break down the agar. B. Agar can convert from liquid to solid form, and back again, very easily. C. Agar is a complete source of nutrients for most bacteria. D. Agar was less expensive than the nutrients that Koch was previously using in the lab.
Pathogenicity, in viruses, often starts by binding the virus with receptors on the surface of the host cell with high specificity. Once bound, the cell engulfs the viral particles in a vesicle and imports them into the cell. What type of transport is this?
a. secondary active transport b. facilitated diffusion c. receptor-mediated endocytosis d. pinocytosis
How many electron pairs are shared between carbon atoms in a molecule that has the formula C2H4?
A) 1 B) 2 C) 3 D) 4