Which of the following is the best measure of an organism's fitness?
a) its size, compared with other members of the same species
b) the number of fertile offspring it produces
c) how long it lives
d) the number of mutations it acquires during its lifetime
e) the amount of care it receives from its parents
Answer: b) the number of fertile offspring it produces
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Organic molecules that are required in small amounts in the diet are called ____ and have diverse roles, including participating in enzymatic reactions
Fill in the blank with the appropriate word.
Each tier of the biomass pyramid depicts the
____ of all the organisms in an ecosystem. a. size b. number of species c. dry weight d. total weight e. total utilization of materials
If the chloride shift did not occur across the RBC membrane:a
oxygen would not be able to bind to hemoglobin. b. carbon dioxide would build up in the tissues. c. bicarbonate ions would build up in the blood cells. d. negative ions would build up in the plasma. e. the Bohr effect would be blocked.
Which of the following is true regarding single pass transmembrane proteins?
A. They traverse the membrane more than once and can only be extracted by using detergents B. Have 2-20 hydrophobic segments C. Protrude from only one side of the membrane D. Are comprised of 90% beta-sheet structures E. Contain only one hydrophobic segment