The electron transport chain begins when ____________________ or ____________________ are oxidized
Fill in the blank(s) with the appropriate word(s).
ANSWER: NAD+; FADH+
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Answer the following statements true (T) or false (F)
1. Animals that do not control internal water concentration also typically do not control the concentrations of ions like sodium and potassium. 2. An animal that exhibits broad tolerance for changes in the salinity of its environment is said to be "euryhaline." 3. The materials in urine are ONLY those that are filtered from the blood or hemolymph and not reabsorbed by the body following filtration. 4. The filtrate that leaves the proximal convoluted tubule is much more concentrated than the blood in humans. 5. The blood supply to the loop of Henle also exhibits a countercurrent arrangement.
Viruses are not considered to be living things, although they can evolve, and they do have genetic material. However, they
a. cannot reproduce on their own. b. cannot cause disease. c. possess a molecular structure entirely different from living cells. d. do not possess DNA. e. do not possess enzymes.
In cells that are constantly involved in secretion, an equivalent amount of membrane must be returned
to the interior of the cell for each vesicle that fuses with the plasma membrane; if this does not occur, then what would happen? a. The ratio of cell surface would decrease, compared to cell volume. b. The cell surface would shrivel. c. The surface area would remain constant. d. The number of membrane receptor proteins would decrease. e. The cell surface will keep expand
One of two of a ribosome's binding sites for tRNA during translation; The P site holds the tRNA carrying the growing polypeptide chain (P stands for peptidyl tRNA)
What will be an ideal response?