The second messenger inositol triphosphate (IP3) appears to be involved in stomatal closure triggered by ____
a. auxins
b. abscisic acid
c. oligosaccharins
d. salicylic acid
e. gibberellins
ANSWER: b
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You purchase two identical houseplants and place them side by side on your windowsill. You keep the soil moist in one of the plants (plant a), and you water the other plant (plant b) only once every two weeks
Do you expect the plants to be the same height after six months of this watering regime? A. Yes, because both plants are still getting water. B. Yes, because both plants are still getting water and sunlight. C. No, because the cells of the apical meristem are unable to express meristem identity genes without sufficient water in plant b. D. No, because the cells of the apical meristem are unable to elongate without sufficient water in plant b.
A moss sporophyte must obtain some carbohydrates from the gametophyte
Indicate whether the statement is true or false.
How does a cell bind with a hormone molecule?
a. It increases its receptor levels. b. Cells circulate through the body looking for hormones to which they can bind. c. Molecules in the cell membrane have a binding site that matches a binding site on the hormone. d. It decreases its receptor levels.
Why is the exponential growth pattern of population growth primarily theoretical?
a. Limited natural resources b. Zero population growth c. Intraspecific competition d. High mortality rates