Beggiatoa are ________.
A. obligate aerobes
B. obligate anaerobes
C. microaerophiles
D. facultative anaerobes
Answer: C
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Which of the following is an example of post-transcriptional control of gene expression?
A) the addition of methyl groups to cytosine bases of DNA B) the binding of transcription factors to a promoter C) the removal of introns and alternative splicing of exons D) gene amplification contributing to cancer E) the folding of DNA to form heterochromatin
Adaptive immunity occurs when
A) death results from pathogen infection. B) the innate immune response fails to eliminate pathogens in the body. C) virulent pathogen infections persist in the body after the initial innate defense response. D) the innate immune response fails to eliminate pathogens in the body and virulent infections persist after the initial innate defense response.
The relevance of the pseudocoelom to phylogeny has been questioned. Rotifera and Nematoda both have a pseudocoelom. The molecular evidence suggests which of the following conclusions?
A. Molecular evidence confirms that rotifers and nematodes are closely related and that both participate in the same monophyletic clade. B. Rotifers are more closely related to Lophotrochozoa than to nematodes. C. Rotifers are more closely related to echinoderms than to nematodes. D. Rotifers are more closely related to chordates than to nematodes. E. Rotifers are more closely related to nematodes than to mollusks.
Which of the following can function better at lower pH?
A. Viruses B. Yeasts and molds C. Bacteria D. Protozoa