Why are G-protein coupled receptors often known as 7TM receptors?
a) They have 7 transmembrane ? --helices.
b) They have 7 transmembrane ?? -pleated sheets.
c) They have 7 nucleotides attached to their structure.
d) They have 7 methionine-tryptophan dipeptides in their structure.
e) They have 7 tyrosine-methionine dipeptides in their structure.
Ans: a) They have 7 transmembrane ? --helices.
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When cloning a sheep, why is it necessary to remove the nucleus from the egg cell and fuse the mammary gland cell, including its nucleus, to the egg cell?
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c. 2 ? 1 ? 3 d. 2 ? 3 ? 1 e. 3 ? 2 ? 1
Information obtained by Franklin from X-ray crystallography on DNA suggested that it is shaped like a
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