The greatest distance among the three genes is between a and c. What does this mean?
A) Gene c is between a and b.
B) Genes are in the order: a—b—c.
C) Gene a is not recombining with c.
D) Gene a is between b and c.
B
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Which of the following statements regarding water flow in vascular plants is false?
A. Water flow through xylem conduits is directly proportional to diameter. B. Flow rate is proportional to the radius of the conduit raised to the fourth power. C. Vessels are much longer and wider than tracheids, thus their rate of water transport is much lower than that of tracheids due to increased resistance. D. The rate at which water moves in plants is a function of the number of conduits and their size. E. Water must cross pits to cross from one cell to another, adding resistance to flow.
The period following dormancy of a seed is called
a. germination. b. abscission. c. guttation. d. scarification. e. desiccation.
The rate of diffusion across a selectively
permeable membrane will be slow when which of the following is (are) true? I. concentration gradients are steep II. temperatures are low III. solutes are small molecules
a. I only b. II only c. I and III d. II and III e. I, II, and III
Two species of tree frogs occupy different elevations in the canopy of a rain forest. If these frogs with strikingly different patterns of coloration but similar patterns of activity are brought together, they can produce offspring that survive to adulthood and can then mate successfully with individuals of either species. What keeps these frogs recognizably distinct?
a. Lack of hybrid fertility b. Habitat isolation c. Temporal isolation d. Mechanical isolation e. Lack of hybrid viability