Which of the following do NOT fix atmospheric nitrogen?
A) cyanobacteria
B) lichens
C) mycorrhizae
D) Rhizobium
E) Azotobacter
C
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The first successful treatment of a genetic disorder by gene therapy was the curing of a 4-year-old girl who had severe combined immunodeficiency disease
Because the engineered cells did not live forever, this child supplemented her treatment with regular doses of A) adenosine deaminase (ADA). B) insulin. C) hemoglobin. D) bacteria. E) B lymphocytes.
You are studying a biochemical pathway. Preliminary results suggest that this pathway is subject to end-product repression. This pathway is therefore most likely to be a(n) ________ pathway
A) anabolic B) catabolic C) constitutive D) induced E) unregulated
Compared to a cell with few aquaporins in its membrane, a cell containing many aquaporins will _____
A) have a faster rate of osmosis B) have a lower water potential C) have a higher water potential D) have a faster rate of active transport
The ability of certain bacterial cells to take on different cell shapes is known as
A) meiosis. B) pleomorphic. C) pallidic. D) pyloric. E) fission.