A group of patients was seen on an emergency basis complaining of abdominal craps and watery diarrhea within 5 hours of attending a picnic in which ham, potato salad, and custard-filled pastries were on the menu. Which of the following is the likely cause of this disease?
A. Attachment and disruption of intestinal lining due to parasitic infection
B. Bacterial colonization and toxin production
C. Bacterial adherence and invasion
D. Performed bacterial toxin
E. Replication of virus that prevents reabsorption of water
Ans: D. Performed bacterial toxin
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To attach a particular amino acid to the tRNA molecule that will transport it, an enzyme, an aminoacyl-tRNA synthetase, is required, along with ATP. Initially, the enzyme has an active site for ATP and another for the amino acid
, but it is not able to attach the tRNA. What must occur for the final attachment to occur? A) The ATP must first have to attach to the tRNA. B) The binding of the first two molecules must cause a 3-D change that opens another active site on the enzyme. C) The ATP must be hydrolyzed to allow the amino acid to bind to the synthetase. D) The tRNA molecule must alter its shape to be able to fit into the active site with the other two molecules. E) The end of the tRNA must be cleaved before it can have an attached amino acid.
Which of the following statements DOES NOT characterize decomposers?
A. They feed on nonliving organic matter. B. They play an important role in nutrient cycling. C. They break down wastes. D. They release nutrients that other organisms can use. E. They synthesize organic molecules.
Which of the following are typically osmoconformers?
a. freshwater teleost fishes b. sharks c. birds d. marine teleost fishes e. freshwater invertebrates
This genetic disorder causes red blood cells to assume an unusual shape and produce abnormal hemoglobin proteins.
A. Tay-Sachs disease B. Huntington's disease C. achondroplasia D. sickle-cell disease