An inactivated toxin, such as that found in the tetanus vaccination, is called a(n)
a. anti-toxin.
b. toxoid.
c. toxin.
d. toxemia.
Answer: B
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Which graph shows that species diversity is much
less at the equator than at 60 degrees north latitude? a. A b. B c. both d. neither e. not enough data is provided to answer the question
If all offspring of a cross have the genotype Aa, the parents of the crosses would most likely be
a. AA ? aa. b. Aa ? Aa. c. Aa ? aa. d. AA ? Aa. e. none of these.
Each of the following is true about Ras except
A) Ras is monomeric. B) Ras activity is inhibited by GTPase activating proteins (GAPs). C) Ras binds steroid hormones. D) Ras is activated by Sos, a guanine nucleotide exchange factor. E) Ras activates a cascade of phosphorylation events within the cell.
Tracheophyte plants are characterized by all of the following except
A. stomata. B. seeds. C. homosporous or heterosporous. D. a specialized water conducting system. E. a waxy cuticle.