Which two enzymes catalyze the steps converting the toxic superoxide ion to less harmful oxygen gas?
A. superoxide dismutase and catalase
B. catalase and hydrogen peroxidases
C. superoxide dismutase and hydrogen peroxidase
D. superoxide dismutase and oxidase
E. catalase and oxidase
Answer: A
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Topsoil is richest in
a. minerals b. sand. c. clay. d. organic matter e. none of these
Alternation of generations in plants refers to the alternation of:
a. diploid and haploid stages. b. male and female stages. c. meiotic and mitotic stages. d. spore and seed stages. e. thallus and leaf stages.
A(n) ________ consists of a motor neuron and all the muscle cells that it stimulates
Fill in the blank(s) with correct word
Which of the following is not a tenant of the Lyon hypothesis?
A) X inactivation occurs early in development. B) initial X inactivation is random. C) X inactivation is passed down during mitosis. D) X inactivation occurs on the maternal X chromosome. E) X inactivation of descendant cells is the same as the progenitor cell.