An example of an epigenetic change is
A. a microbe secreting hyaluronidase to break down host hyaluronic acid.
B. a microbe that can induce changes in host DNA, resulting in suppression of defenses or weakening of individual cells.
C. a gram-negative organism releasing lipopolysaccharide from its cell wall upon lysis.
D. Clostridium tetani secreting the exotoxin tetanospasmin.
Answer: B
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A human cell with a total of 23 chromosomes would be considered:
A. haploid. B. diploid. C. polyploid. D. euploid.
The most common cause of liver cancer in the United States is hepatitis ________ virus.
A. A B. B C. C D. D
Which of the following is a true statement?
A. Species with nucleotide sequences that match closely share a common ancestor. B. Molecular biologists have suggested that bacteria are more closely related to eukaryotes than are members of the domain Archaea. C. Adaptation to the environment is not related to the origin of new species. D. The genetic language of DNA and RNA provides evidence that contradicts evolution of finches and other birds.
Of the catabolic pathways: glycolysis, fermentation, anaerobic respiration, and aerobic respiration, which can proceed without molecular oxygen (O2) present?
A. Fermentation only B. Glycolysis, anaerobic respiration, and fermentation C. Anaerobic respiration only D. Both aerobic respiration and fermentation