Answer the question using the accompanying figure.Which structure vibrates and bends the sensory hairs?
a. 1
b. 2
c. 3
d. 4
e. 5
ANSWER: e
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Substrate activation may involve
A) a change in enzyme conformation induced by substrate binding. B) accepting protons from the enzyme. C) formation of temporary covalent bonds. D) donation of protons to the enzyme. E) all of the above
Many root epidermal cells grow projections called ________, which extend from their surface and help in the absorption of water and minerals
A) rhizomes B) cilia C) root hairs D) villi E) rhizoids
Proteins that distinguish among serovars of gram-negative bacteria are found in which structures?
a) Fimbriae b) Pili c) Flagella d) Axial filaments
The core histones are small, basic proteins that have a globular domain at the C-terminus and a long, extended conformation at the N-terminus. Which of the following is not true of the N-terminal "tail" of these histones?
(a) It is subject to covalent modifications. (b) It extends out of the nucleosome core. (c) It binds to DNA in a sequence-specific manner. (d) It helps DNA pack tightly.