Specific recognition between cell types such as leukocytes and endothelial cells of blood vessels is mediated by cell-surface glycoproteins called

a. selectins.
b. fibronectins.
c. spectrins.
d. porins.


Ans: a. selectins.

Biology & Microbiology

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Neutrophils are the second phagocytic cell to respond to an infection

Indicate whether this statement is true or false.

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Tall corn plants (T) are dominant to dwarf plants (tt). Solid green leaves (G) are dominant to leaves with a white tip (gg). A cross between two corn plants yielded the following phenotypes: 51 tall plants with a white tip on their leaves; 43 dwarf plants with solid leaves; 48 dwarf plants with white tips on their leaves; 45 tall plants with solid leaves. What are the genotypes of the parents

that produced these plants? a. TtGg x TtGg b. TtGg x Ttgg c. ttGG x TTgg d. TtGg x ttgg e. None of the above

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Both marine fish and marine mammals have body fluids with a lower salt concentration. However, unlike fish, marine mammals do not drink seawater, although they do swallow some with their food. How are marine mammals able to maintain their internal supply of water?

What will be an ideal response?

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A gene that produces a protein important in more than one biochemical pathway is

a) dominant. b) recessive. c) pleiotropic. d) codominant. e) incomplete dominant.

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