In oxidative phosphorylation, energy for the synthesis of ATP is directly obtained from the
A) splitting of oxygen molecules.
B) breaking of the covalent bonds in glucose.
C) movement of hydrogen ions through channels in the inner mitochondrial membrane.
D) combination of two atoms of hydrogen and one atom of oxygen to form water.
E) oxidation of acetyl-CoA.
Answer: C
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Photoreceptors are modified neurons. However, they differ from most neurons in the fact that ________
A) photoreceptors do not have fluctuations in membrane potential B) photoreceptors do not release neurotransmitters C) photoreceptors are sensitive to energy changes in the external environment D) photoreceptors will hyperpolarize when stimulated
How could you best improve the contrast of this specimen?
What will be an ideal response?
A cell is placed in a hypotonic solution. The cell will
a. lose water by diffusion b. gain water by osmosis c. lose water by exocytosis d. gain water by pinocytosis e. remain unchanged
Bone, or osseous, tissue provides protection for our vital organs since the inorganic ground substance is:
A) calcium phosphate crystals. B) both collagen and elastic fibers. C) mostly water, dissolved solutes, and proteins. D) collagen fibers.