A structure formed from the combination of cyanobacterial microbes and sediments is called:
a. a coral reef.
b. a bacteria reef.
c. a stromatolite.
d. a stalactite.
e. a stalagmite.
C
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A serious limitation of using a retrovirus as a vector for gene therapy is that
A) the retrovirus may insert into a proto-oncogene, causing cancer. B) a genetically modified retrovirus causes AIDS. C) it causes ADA accumulation. D) reverse transcriptase will not work in human cells.
The step of translation in which amino acids are added to the growing polypeptide is
mitosis. initiation. elongation. termination. transcription.
What must happen in order for a donor organ to not be rejected by the recipient?
a. The MHC complexes need to match as closely as possible. b. The recipient's plasma cells will be inactivated. c. The recipient's passive immunity pathway will be activated. d. The NK cells of the recipient will be inactivated. e. The cytotoxic T cells will be inactivated.
From the late 1950s to the mid-1960s, numerous experiments using in vitro cell-free systems provided information on the nature of the genetic code. Briefly explain how the use of polynucleotide phosphorylase and the triplet binding assay were used to
decipher the genetic code and why the triplet binding assay was more precise. What will be an ideal response?