Which is NOT TRUE about chemoautotrophs?
a. They were the first cells on earth.
b. They thrived on oxygen.
c. They used methane as a carbon source.
d. Many became extinct with the arrival of
photoautotrophs.
e. They did not use solar energy to feed
themselves.
Answer: b
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The physical appearance and physiology of an organism, resulting from interactions of its genetic makeup and its environment, is its
(a) phenotype. (b) hybrid vigor. (c) dominance. (d) genotype.
Over winding of the DNA decreases the number of turns in the double helix, and thus results in super coils in the DNA
Indicate whether the statement is true or false
Development of new vaccines has slowed in recent decades. This is due to
A) the ineffectiveness of vaccines against disease. B) the availability of vaccines against nearly all serious diseases. C) the high cost of development. D) the high level of risk with immunization. E) a lack of need with modern medical treatments.
Two proteins, Rag-1 and Rag-2, catalyze VDJ recombination. What is the likely outcome of a deletion of the Rag genes?
A. Mild susceptibility to infection due to T cell defects B. Severe combined immunodeficiency (SCID) of both B and T cells C. Increased antibody diversity from B cells D. Increased resistance to infection due to enhanced B and T cell function