Which of the following is a function of the thymus?
a) production of red blood cells
b) secretion of antibodies
c) production and maintenance of stem cells
d) site for the maturation of lymphocytes
Answer: d) site for the maturation of lymphocytes
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The organic non-protein components that aid in enzyme functioning are called
A. reactants. B. cofactors. C. coenzymes. D. substrates. E. products.
Point mutations may have no effect on an organism if (select all correct choices):
A. they occur in a non-coding region of DNA. B. the new codon codes for the same amino acid as the original codon. C. they occur only in somatic cells. D. the new codon codes for an amino acid that is the same size as the one coded for by the original codon. E. they occur only in germ cells.
What is a disadvantage of the exoskeleton?
a. It cannot be replaced if damaged. b. It must be shed to accommodate growth. c. It is easily penetrated by predators. d. It requires high ATP levels for continuous growth. e. It does not permit movement of the organism.
Which of the following are within the range of most radiation reaching the surface of Earth?
a. near-infrared and infrared radiation b. infrared radiation and microwaves c. ultraviolet and near-infrared radiation d. ultraviolet radiation and X-rays