What determines the specificity of a receptor protein?
A. the cytoplasmic domain
B. the transmembrane domain
C. the ligand-binding site
D. the extracellular domain
C
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Which of the following is true of water?
a. The oxygen end is slightly electropositive. b. Hydrogen bonds hold water molecules together. c. Water covers about one-half of the earth’s surface. d. It participates in hydrophobic interactions with polar molecules. e. Its solvent properties are greatest with nonpolar molecules.
Which of the following is an example of a neural function?
a. secretion of products b. contraction when stimulated c. protection from invasion by bacteria d. facilitation of diffusion
Which of the following is exemplified by a pea tendril contacting a string or wire and coiling around it for support?
A) gravitropism B) photoperiod C) thigmotropism D) phototropism
What is cooperative binding and why is it important for repressor function?
What will be an ideal response?