Which of the following terms refers to a prokaryotic cell that is comma shaped?
A) coccus
B) coccobacilli
C) vibrio
D) spirillum
Ans: C) vibrio
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Which of the following is not a complementary base pair usually found in DNA molecules?
A. Adenine-uracil B. Guanine-cytosine C. Adenine-thymine D. All of the choices are correct.
Excess nutrients in the aquatic environment can cause an initial population surge of primary producers, but eventually results in a collapse of the ecosystem. Which of the following answer choices is not a direct reflection of this statement?
A. Habitats have a particular carrying capacity. B. All trophic levels can be interdependent. C. Communities are shaped by the physical environment. D. Animals interact with their physical environment.
Annuals are never
a. grasses. b. herbaceous plants. c. herbs. d. woody plants
What defines radial symmetry?
A) Any plane of symmetry passing through the center of the organism splits it into equal halves. B) Only five planes of symmetry passing through the center of the organism splits it into equal halves. C) Only one plane of symmetry splits the organism into equal halves. D) No planes of symmetry exist; the organism cannot be split into equal halves.