The cell wall of Gram-positive bacteria
A. contains a thin layer of peptidoglycan.
B. contains a thick layer of peptidoglycan.
C. is, due to its thickness, an excellent barrier to most molecules.
D. contains an outer membrane containing LPS.
E. contains a thin layer of peptidoglycan AND contains an outer membrane containing LPS.
B
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Impetigo is caused by ________.
A. C. diphtheriae B. S. pyogenes C. C. perfringens D. S. aureus E. Both S. aureus and S. pyogenes are correct.
Endotoxins include which of the following?
A. Lipopolysaccharide B. Tetanus toxin C. Botulinum toxin D. Diphtheria toxin
Retroviruses have a +ssRNA as their genome. In order to complete an infection, they must first make a ________ molecule, which they use to direct the synthesis of mRNA.
A. -ssRNA B. dsDNA C. dsRNA D. DNA:RNA hybrid
What key conclusion did Riesch and Schlupp draw from the life history data of the Atlantic mollies?
A. More energy is invested in producing larger offspring when the populations live in environmentally stressful habitats. B. The populations exposed to H2S are able to use the toxic molecule for metabolic energy. C. Genetic regulation in the species results in production of equal sizes of offspring whether exposed to stressful environments or not. D. More energy is invested in producing many more offspring when the populations live in environmentally stressful habitats. E. The populations are only able to survive and reproduce when in stressful environments of either darkness or H2S.