In the Meselson-Stahl experiment, 15N-labeled cells were shifted to 14N medium at what is designated as generation 0. For the conservative model of replication, what proportion of 15N-15N, 15N- 14N, and 14N-14N would you expect to find after one replication cycle?

½ 15N-15N and ½ 14N-14N

Explanation:

The conservative model of replication is was postulated as the process in which an intact/whole double helix acts as a template for a newly synthesized double helix. According to Messelson-Stahl experiment, after the first round of replication, the parents strand which is the 15N-15N will act as a template to form the new strand which is the 14N-14N after taking up this form of nitrogen. Thus we have one whole double helix parental 15N-15N and one newly synthesized double helix 14N-14N. There would be no combination of the two.

these muscles maintain the blood pressure in the vessels. the smooth muscles are innervated by nerves of the autonomic nervous system. when the muscles contract, they cause vasoconstriction of the vessels and increase blood pressure. when the muscles relax, they enable vasodilation of the   blood vessels hence reduce blood pressure.