Discuss the functions of the cytoskeleton of the cell.
What will be an ideal response?
The cytoskeleton helps to determine the shapes of animal cells, and it helps them change shape rapidly. It also provides a framework for ribosomes to carry out protein synthesis, and serves as a point where enzymes can be localized.
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Klebsiella spp. were isolated from a sputum sample, and susceptibility testing was performed. The isolates were sensitive to several antibiotics; however, they were resistant to ampicillin. Which one of the following statements explains this discrepancy?
a. The ampicillin disk is most likely expired. b. Because Klebsiella spp. should be sensi-tive to ampicillin, a technical error is to blame. c. Ampicillin inhibits cell wall synthesis. In addition, because Klebsiella spp. do not have a cell wall, they should not have been tested for ampicillin. d. No discrepancy is present; Klebsiella spp. are normally resistant to ampicillin.
Examine the figure above. What type of pattern did the human population exhibit through most of its history (prior to the 1700s)?
A. logistic growth
B. exponential growth
C. zero growth (equilbrium)
D. negative growth
Members of the ____ Ecdysozoan phylum include insects, spiders, crustaceans, millipedes, and centipedes
a. Arthropoda b. Onychophora c. Nemertea d. Annelida e. Nematoda
During the Pleistocene epoch, plant communities changed dynamically in response to:
a. a meteor impact. b. intense grazing pressure. c. competition with gymnosperms. d. iridium in the soil. e. fluctuating climates (ice ages).