Some bacteria are resistant to erythromycin as a result of mutation of their ribosomal RNA. What type of resistance does this represent?
A. alteration of the target of the drug
B. inactivation of the drug
C. change in the permeability of the drug
D. overproduction of an enzyme in a key metabolic pathway
E. removal of the drug via a pump
Answer: A
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Which of the following statements are true of the stomata on the leaves of vascular plants?
_____ They regulate intake of carbon dioxide needed for photosynthesis. _____ They regulate release of oxygen to the air. _____ They regulate loss of water. _____ They are able to open or close depending on environmental conditions. _____ They regulate the absorption of light by chlorophyll.
Transduction was discovered in 1952 by this Nobel Prize winner
a. Francois Jacob b. Elie L. Wollman c. Gregor Mendel d. Joshua Lederberg e. Fred Griffith
Answer the following statements true (T) or false (F)
1. A reason that some antibiotics harm bacteria but not humans is because these antibiotics inhibit enzymes only found in bacteria.
2.. Phagocytosis is a process that cells use to move large particles in through the cell membrane.
3. Receptor-mediated endocytosis is a specialized, more selective method of cell membrane transport than pinocytosis.
4. In addition to providing energy to the organism conducting photosynthesis, photosynthesis also provides raw materials and energy for heterotrophic organisms.
5. As this graph shows, photosynthesizing eukaryotes have several pigments and accessory pigments that selectively capture the green wavelengths of photons for photosynthesis.
As large tracts of rain forest disappear due to human activities, the region tends to become drier. Why?
What will be an ideal response?