Which of the following statements best describes the benefit of lichens for humans?
A. Lichens can be used to monitor levels of chemical pollutants in the air.
B. Lichens can be used to monitor radiation levels.
C. Lichens begin soil formation by breaking down parent rock.
D. Lichens fix nitrogen.
E. all of the choices provided
E. all of the choices provided
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Which of these is found in all amino acids?
A. -COOH B. -COH C. -OH D. -NH2 E. Both -COOH and -NH2
Activation of cytotoxic T cells requires binding to class I MHC molecule complexed with a foreign antigen and the release of ________ from ________.
A) interleukin-1 : helper T cells B) interleukin-2 : helper T cells C) interleukin-10 : macrophages D) interleukin-2 : macrophages E) interleukin-1 : macrophages
The basic structural polysaccharide of fungal cell walls, crab shells, and insect exoskeletons is
a. cellulose. b. chitin. c. collagen. d. hemicellulose.
Gene therapy:
A) involves introducing non-defective genes into the cells of an individual with a genetic disorder. B) relies on drug treatment of patients with genetic disorders at specific times that correspond with cell division. C) involves no controversial or ethical questions. D) is defined as the replacement of organs from patients with genetic disorders by transplant. E) has been wildly successful in curing human diseases.