A person working with plants may reduce the inhibition of apical dominance by auxin via which of the following?
a. pruning shoot tips
b. deep watering of the roots
c. fertilizing
d. treating the plants with auxins
e. feeding the plants nutrients
Ans: a. pruning shoot tips
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A research lab is trying to produce new antibiotics. They come up with drugs that detach the hydrophilic heads from the phospholipids in plasma membranes. This drug
A. would be highly toxic and completely useless for human beings-we also have plasma membranes with hydrophilic head groups! B. would be highly toxic only to bacteria, making it an excellent drug to develop and test further. Humans have a different phospholipid structure in their cell plasma membranes than bacteria. C. would generally not be toxic enough to damage Gram-negative bacteria, as their plasma membranes lie under a thick layer of peptidoglycan. D. would be highly toxic for human beings, but might be useful as a topical antibiotic skin cream. The top layer of skin cells is dead anyway, so it wouldn't matter if this damaged those cells. It could NOT be taken internally, though, by human beings.
How do saltwater fishes conserve water?
a) Their kidneys produce small amounts of concentrated uric acid b) Their kidneys produce small amounts of concentrated urine c) Their kidneys produce large amounts of dilute urine d) they absorb extra water from their environment
Compare and contrast the lactose operon with the tryptophan operon
What will be an ideal response?
What happens when DNA polymerase replicating DNA encounters RNA polymerase transcribing DNA in the same direction?
What will be an ideal response?