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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Which of the following numbered events represents the correct sequence of events of prokaryotic translation
initiation? 1) large ribosomal subunit binds to initiation complex 2) initiation tRNA binds small ribosomal subunit 3) initiation complex binds to ribosome recognition sequence on mRNA a. 1 ? 2 ? 3 b. 1 ? 3 ? 2
c. 2 ? 1 ? 3 d. 2 ? 3 ? 1 e. 3 ? 2 ? 1
In a parasitic relationship where the host contracts a disease and sometimes dies, the parasite is called a(n):
a. predator. b. keystone species. c. mutualistic symbiont. d. interspecific competitor. e. pathogen.
Information obtained by Franklin from X-ray crystallography on DNA suggested that it is shaped like a
A. hollow cylinder. B. pleated sheet. C. icosahedron. D. helix. E. ribbon.
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?
a. because only cells with the nucleus of a mammary gland cell will divide; the cells with the nucleus of an egg cell will not divide b. because mammary gland cells are only found in females c. because the egg cell has only a haploid complement of genes, whereas the mammary gland cell has a diploid complement d. because the egg cell has a diploid complement of genes, whereas the mammary gland cell has a haploid complement e. because without the mammary gland cell, the newborn clone will have no mammary glands from which to receive nutrition