Mycoplasma
A. lack peptidoglycan.
B. are the smallest free-living organisms.
C. have sterols in their membranes.
D. are killed by penicillin.
E. lack peptidoglycan, are the smallest free-living organisms AND have sterols in their membranes.
E
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If you allowed 10 identical parallel Salmonella cultures to evolve for 10,000 generations under new growth conditions with very little nitrogen, the parallel cultures would
A) evolve identical adaptations to use the nitrogen source provided in the media. B) not change or adapt very much over this small number of generations. C) each accumulate different random mutations resulting in different adaptations to use the nitrogen in the media. D) direct mutations to occur in nitrogen utilization and uptake genes in order to adapt rapidly to the culture conditions.
A few species of actinomycetes have been found to be pathogenic in humans, other animals, and plants.
Answer the following statement true (T) or false (F)
Which plants keep their stomata open only at night?
A. CAM B. C3 C. C4 D. No plants keep their stomata open only at night E. All plants do.
When a membrane is said to be selectively permeable, this means that _____
A. half of the membrane is permeable, and the other half is not B. only water can pass through it C. the membrane regulates movement of substances into and out of the cell D. the membrane is permeable only part of the time