Blood smears are used in diagnosis of
A. African sleeping sickness.
B. toxoplasmosis.
C. malaria.
D. African sleeping sickness and malaria.
E. toxoplasmosis and malaria.
Answer: D
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Answer the following statement true (T) or false (F)
While studying a protein synthesized by human liver cells, you notice a correlation between stress and decreased levels of this protein. Initially, you hypothesized that stress caused phosphorylation of eIF-2, and a commensurate reduction in protein synthesis, but further investigation revealed that the rate of synthesis of this protein had not changed—there simply was not as much within the cells as expected, nor was the protein being secreted by the cells. What possible explanation remains?
a. Stress alters the protein structure making it undetectable. b. Stress weakens the polypeptide bonds in this protein. c. Stress causes ubiquitin to bond to the protein. d. Stress causes eIF-2 to hydrolyze the protein.
Unusual eukaryotic-like (possessing a defined nucleus) cells were obtained from a sample of water from a subglacial antarctic lake
To investigate the properties of the new organism's genome, the nucleus was carefully isolated and the chromatin obtained. The fibers had a "beads on a string" appearance, suggesting some type of "histones." Following digestion with micrococcal nuclease, protein removal, and gel electrophoresis, DNA fragments were obtained that are multiples of 280 base pairs in length. Longer incubation with micrococcal nuclease prior to protein removal results in fragments 200 base pairs in length. The amount of DNA that is wrapped around the "core histones" is therefore A) 80 base pairs in length. B) 200 base pairs in length. C) 360 base pairs in length. D) 480 base pairs in length. E) Not enough information is given to determine the answer.