Which of the following methods could be used to detect the presence of viable but nonculturable cells of a pathogen in a water or food specimen?
A. Culture on selective agar
B. Use of enrichment techniques
C. Culture on enriched agar
D. Polymerase chain reaction
Answer: D
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Which statement is most consistent with the hypothesis that the Cambrian explosion was caused by the rise of predator-prey relationships? The fossil record reveals an increased incidence of _____.'
A) hard parts B) larger animals C) worm burrows D) organic material
If a monohybrid cross results in 1:2:1 genotypic and phenotypic ratios in the offspring, then which type of inheritance
might be at work?
a. dominance b. incomplete dominance c. epistasis d. pleiotropy e. polygenic inheritance
Autotrophs:a
are exemplified by fungi. b. are exemplified by animals. c. cannot carry out cellular respiration. d. depend on heterotrophs for food. e. synthesize complex molecules from CO2, water, and energy.
Why do animals in deep ocean depths live in complete darkness?
a. because 100% of the ocean is at a depth where no light penetrates b. because over 90% of the ocean is at a depth where no light penetrates c. because over 80% of the ocean is at a depth where no light penetrates d. because over 70% of the ocean is at a depth where no light penetrates