A newly mated queen ant establishes an ant nest in an unoccupied patch of suitable habitat. The population of the nest grows quickly at first, then levels off at carrying capacity. Which of the following models best describes its population growth?
A) linear
B) logarithmic
C) logistic
D) exponential
Answer: C
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Viroids characteristically are composed of
A. ssRNA. B. dsRNA. C. ssDNA. D. dsDNA.
Periderm is produced by:
a. xylem. b. cork cambium. c. pith. d. cortex. e. phloem.
Which of the following would help a virus avoid triggering an effective adaptive immune response? I) having frequent mutations in genes for surface proteins II) building the viral shell from host proteins III) producing proteins very similar to
those of other viruses IV) infecting and killing helper T cells A) only I and III B) only I, II, and IV C) only I, II, and III D) only II, III, and IV
The following are characteristics of Chlamydias except
A. they are gram negative. B. elementary bodies are the infectious form. C. reticulate bodies differentiate into elementary bodies. D. elementary bodies are metabolically active. E. they are obligate intracellular parasites that need host cells for growth.