HELP ME PLEASE Question 18 of 34
How do the structures of alveoli and capillaries support the function of gas
exchange?
Bronchiole
Alveoll
Smal blood
vessels (capillarles)
A. The shapes of the alveoli and the capillaries allow for a large
surface area for gas exchange.
B. Pores in the membranes allow oxygen to move out of the alveoli's
cells and carbon dioxide to move into the cells.
C. The shapes of the alveoli and the capillaries slow blood flow,
allowing for more time for gas exchange.
D. The membranes have proteins that transport carbon dioxide and
oxygen against the concentration gradients.

Keeping in mind the life cycle of bacteriophages, consider the following problem: during the reproductive cycle of a temperate bacteriophage, the viral dna inserts into the bacterial chromosome where the resultant prophage behaves much like a trojan horse. it can remain quiescent, or it can become lytic and initiate a burst of progeny viruses. several operons maintain the prophage state by interacting with a repressor that keeps the lytic cycle in check. insults (ultraviolet light, for example) to the bacterial cell lead to a partial breakdown of the repressor, which in turn causes the production of enzymes involved in the lytic cycle. as stated in this simple form, would you consider this system of regulation to be operating under positive or negative control?

Individuals do not compete directly for resources, but are prey for the same predator

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