Describe the evidence for the existence of a flowering promoter and also for the existence of a flowering inhibitor. What will be an ideal response?
A long-day tobacco plant is grafted to a day-neutral tobacco plant and both plants are
exposed to long days. Under these conditions both plants flower, suggesting that a flowering
promoter produced in the long-day plant moves across the graft to the day-neutral plant and
stimulates flowering.
A long-day tobacco plant is grafted to a day-neutral tobacco plant and both plants are
exposed to short days. Under these conditions neither plant flowers even though the dayneutral
plant would normally flower under short day conditions. This suggests that the longday
plant produces a flowering inhibitor that moves across the graft and inhibits flowering in
the day-neutral plant.
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Secondary disinfection of drinking water is necessary to
A) maintain sufficient residual in the water distribution system to inhibit microbial growth. B) prevent the formation of biofilms on pipes in the water distribution system. C) neutralize taste- and odor-producing organic compounds. D) kill Cryptosporidium and other resistant pathogens.
Referring to the above diagram of the brain, which letter identifies the region responsible for coordinating motor
activity?
a. D b. E c. F d. G e. H
Which classification is the best description of humans?
a. herbivore b. carnivore c. omnivore d. decomposer e. photosynthetic organism
If an X-linked recessive trait has a frequency of 5% in males, what percentage of females are carriers? (Assume that the population is in Hardy-Weinberg equilibrium.)
A) 9.5% B) 5% C) 95% D) 4.2% E) 10%