Azolla filiculoides is a small aquatic fern that is typically 1-2 cm tall. How would a botanist distinguish it from a bryophyte?
A. It has xylem tissue.
B. It produces seeds.
C. It has chloroplasts.
D. It has a gametophyte.
Answer: A
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If 20% of nucleotides in the DNA of a particular organism contain thymine, estimate the percentage of cytosine that is present in the DNA.
A. 40% B. 80% C. 20% D. 15% E. 30%
What is the first piece of information that is used in the identification of an unknown bacterial isolate?
A. The ability of the bacterial isolate to ferment glucose B. The Gram stain morphology C. The ability of the bacterial isolate to ferment lactose D. The presence of catalase enzyme
Adenine and guanine are
a. double-ringed purines. b. single-ringed purines. c. double-ringed pyrimidines. d. single-ringed pyrimidines. e. nucleotides.
In some areas, fluoride is added during the municipal water treatment process in order to help
A) prevent goiter. B) prevent the growth of bacteria. C) prevent the development of mental retardation. D) reduce tooth decay.