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 day-neutral plant would
normally flower under short day conditions. This suggests that the long-day plant produces a
flowering inhibitor that moves across the graft and inhibits flowering in the day-neutral plant.
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Members of phylum Nemertea have a tube-with-a-tube body plan
____________________ Indicate whether the statement is true or false.
Concerning diatoms' potential use as drug-delivery systems, which anatomical feature would seem to be most important?
a. their ability to withstand immense pressure b. the chemical composition of their cell walls c. the porous nature of their cell walls d. the chemical composition of their food-storage material e. the nuclear envelope
Which structures are restricted, causing an asthma attack?
a. Trachea b. Bronchioles c. Alveoli d. Capillaries
Selective uptake of molecules into a cell by vacuole formation after they bind to specific receptor proteins in the plasma membrane.
What will be an ideal response?