Gribbles play an important role in kelp communities
a. by weakening holdfasts enabling kelps to be replaced.
b. by strengthening holdfasts enabling kelps to remain attached.
c. by randomly disturbing the environment.
d. by providing substrate for kelp undercover species.
e. by acting as keystone predators.
A
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A microbiologist studying the human microbiome is interested in how a particular bacterial species may impact water absorption in the large intestine. Which of the following models is appropriate for this investigation?
A. A normal mouse colonized with enteric microbiota found in the human colon. B. A germfree mouse inoculated with human microbiota shortly after birth. C. A human volunteer who is a carrier of that particular bacterial species. D. A germfree mouse raised in a sterile environment.
Which of the following is a difference between prokaryotes and eukaryotes?
a. In prokaryotes, the DNA is sequestered inside the nucleus; in eukaryotes, it is in the cytoplasm. b. In eukaryotes, transcription starts with a final copy of mRNA; in prokaryotes, there is pre-mRNA, and it must be edited to make the final transcript. c. In eukaryotes, translation only occurs after transcription; in prokaryotes, they happen simultaneously. d. In prokaryotes, there are exons and introns; in eukaryotes, there are neither of these.
If a person had only cone cells in the retina, this would most likely result in
a. an inability to distinguish red from green. b. an inability to perceive any color at all. c. difficulty seeing in dim light. d. difficulty seeing in very bright light. e. poor perception of detail in the center of the visual field.
The maximum rate of increase of a population is its
a. potential. b. carrying capacity. c. exponential growth. d. distribution. e. reproductive base.