How many membranes make up a chloroplast?
A. 1
B. 2
C. 3
D. 5
Answer Key: C
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Typical electron donors used by dissimilative sulfate-reducers are
A) hydrogen, water, and hyrdrogen sulfide. B) hydrogen, lactate, and pyruvate. C) carbon dioxide, hydrogen, and water. D) sulfate, sulfur, and thiosulfate.
If a combination of two or more genes is required to produce a specific trait, it is called a(n) _______
A. overdominance B. simple mendelian trait C. sex-influenced trait D. sex-linked trait E. gene interaction
DNA associates very tightly with nucleosomes because
A. DNA can form covalent bonds with histone proteins. B. negative charges on DNA are attracted to positive charges of the histone proteins. C. the histone tails wrap tightly around the DNA double helix. D. the amino acids of histone proteins are largely acidic, while DNA molecules are basic. E. histone H1 tightens the coils of DNA that are wrapped around the nucleosome.
Which of the following fungal infections may progress to infection of the brain?
A. Coccidioides immitis B. Cryptococcus neoformans C. Mucor D. both Coccidioides immitis and Cryptococcus neoformans E. Coccidioides immitis, Cryptococcus neoformans, and Mucor