The greatest incidence of skin cancer (melanoma) would be expected to occur in
A) people who are deficient in vitamin D and live near the poles.
B) people who are deficient in folate and live near the poles.
C) people who are deficient in vitamin D and live near the equator.
D) people who are deficient in folate and live near the equator.
Answer: D
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The genus Frankia
A. produces heat resistant endospores and is strictly a marine bacterium. B. produces heat-resistant endospores. C. grows in symbiotic association with the roots of some higher plants and fixes nitrogen. D. is strictly a marine bacterium.
A dendritic cell with an antigen displayed on its surface is called a(n) ____
a. cytotoxic T cell b. plasma cell c. antigen presenting cell d. major histocompatibility complex e. CD4+ T cell
________ mutations occur in the promoter or operator region of a gene or set of genes and affects the expression of the downstream genes without affecting the amino acid sequences of the gene products.
Fill in the blank(s) with the appropriate word(s).
To obtain optimal production in a small garden, one should
A) plant seeds in rows with minimal spacing between rows. B) plant seeds in clumps with large spaces between clumps. C) plant seeds in a uniform pattern throughout the garden. D) sow seeds randomly throughout the garden.