A Western blot assay was performed, and bands were observed at p24, p41, and gp120/160 (kilodaltons). The organism can be identified as:
a. herpes simplex virus.
b. human immunodeficiency virus (HIV).
c. Borrelia burgdorferi.
d. T. pallidum.
B
In the HIV Western blot test, a positive blot has any two of the following bands: p24, p41, and gp120/160.
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A researcher is studying the integral membrane protein "mysteriase" and chooses to perform an experiment similar to that performed by Frye and Edidin. The researcher fuses a mouse cell expressing mysteriase with a human cell. The fused cell is incubated at 37?C prior to being cooled to 0?C and labeled with a fluorescent antibody against mysteriase. When observed with a fluorescent microscope,
mysteriase is observed to remain on one side of the fused cell. What is the most likely explanation for this surprising observation? A. Mysteriase rigidifies the plasma membrane B. There is an error in the experimental procedure because this result is impossible C. Mysteriase is bound to the cytoskeletal filament D. Mouse cells are less fluid than human cells E. Mysteriase is a flippase enzyme that enhances lipid flip-flop rather than lipid lateral movement
What is the composition of a Barr body?
What will be an ideal response?
Aerobic cyanobacteria carry out the reactions of nitrogen fixation in
A) akinetes. B) endospores. C) heterocysts. D) chloroplasts. E) lamellae.
Wild type bread mold can grow in a minimal medium without supplements, while certain mutated strains can only grow in a minimal medium that is supplemented with specific intermediates found in the following metabolic pathway for arginine synthesis. See the figure below for an overview of the arginine biosynthetic pathway.A strain that can grow in minimal medium containing ornithine, citrulline, or arginine, but not in minimal medium alone would have a mutation in the gene that encodes for
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A. enzyme 1. B. enzyme 2. C. enzymes 1, 2, and 3. D. The strain would be the wild type with no genetic mutations. E. enzyme 3.