Which of the following is mismatched?
a. cytokinin; inhibits lateral root formation
b. auxin; promotes cell elongation
c. gibberellin; involved in phototropism and
gravitropism
d. abscisic acid; promotes stomatal closure
e. ethylene; promotes leaf abscission
C
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The major structural components of a cell membrane are ____
a. phospholipids and cellulose b. phospholipids, protein, and sterols c. protein and sterols d. glycolipids and proteins e. phospholipids and glycolipids
Sometimes plant species that grow in the same area cannot interbreed because their physical shape has become specialized for different types of pollinators. What type of reproductive isolation is occurring?
a. mechanical b. ecological c. behavioral d. gamete incompatibility e. temporal
The first barrier to invasion is
a. antibody production. b. intact skin and body cavity linings. c. direct attack by white blood cells. d. innate immunity. e. development of memory cells.
You have chosen RNA as the most likely molecule to be first enclosed by a membrane. You understand that it has the ability to store information and can self-replicate, but what else is necessary for simple metabolic processes to occur in a timely manner?
A. A biological catalyst. B. Energy from ADP. C. A pump, to drive a concentration gradient. D. A more stable nucleic acid. E. The ability to carry out structural roles.