The organ of Corti is
a. a chemoreceptor.
b. a mechanoreceptor.
c. a photoreceptor.
d. a nociceptor.
e. all of these.
Answer: b
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In the fluid mosaic model of a typical plasma
membrane, what accounts for the fluidity?
a. the proteins, being large, cause the membrane to jiggle around. b. the phospholipids collectively form a jellylike substance similar to the cytoplasm. c. the phospholipids are not bonded to each other and thus are more free to move around. d. water molecules infiltrate the bilayer causing it to become more watery and thus more fluid. e. the phospholipids in a typical plasma membrane form covalent bonds which are elastic and allow the membrane to ‘stretch’.
Which of the following have chloroplasts (or structures since evolved from chloroplasts) thought to be derived from ancestral green algae?
A) stramenopiles B) apicomplexans C) dinoflagellates D) chlorarachniophytes
In a cell with a diploid number of 28, how many chromatids are present at prophase of mitosis?
A. 14
B. 28
C. 56
D. 112
CD4 and CD8 T cells are likely to become active when they:
A) are attracted by the inflammatory response. B) travel through lymph nodes. C) interact with B-cells. D) travel through the spleen. E) dock with a dendritic cell with a matching antigen.