Which of the following microbes produces a protein that kills a variety of insect pests?
A) Pseudomonas
B) Haemophilus influenzae
C) Bacillus thuringiensis
D) Thermus aquaticus
E) Plasmodium falciparum
C
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Which of the following is a component of the spore—or zygote—wall (in mosses, ferns, gymnosperms, and angiosperms) and helps prevent the desiccation of these structures?
A. sporangium B. sporopollenin C. chitin D. peptidoglycan E. sporangia
Which mechanism(s) increase(s) genetic diversity?
a. crossing-over between chromosomes during meiosis only b. independent assortment of chromosomes during meiosis only c. random DNA mutations only d. crossing-over between chromosomes and independent assortment of chromosomes during meiosis only e. crossing-over between chromosomes, independent assortment of chromosomes during meiosis, and random DNA mutations
The pathogenesis of poststreptococcal glomerulonephritis involves:
A. deposition of immune complexes in the kidneys. B. destruction of glomeruli by streptolysin O. C. bacterial-induced dehydration. D. invasion of the kidneys by Streptococcus pyogenes
Insulin and glucagon are produced by a:
A) small proportion of the cells in the pituitary. B) large proportion of the cells in the pancreas. C) large proportion of the cells in the adrenal glands. D) small proportion of the cells in the pancreas.