T cells multiply and become specialized in the
a. bone marrow.
b. spleen.
c. thymus.
d. thyroid.
e. tonsils.
C
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Based on the table of attributes given below, which of the following statements are FALSE about the two organisms?
Characteristic Bacterium A Bacterium B Endospore formation yes no Capsule no yes Type IV pili yes no Flagella no no Morphology bacillus bacillus A) Bacterium A is more resistant to heat and ultraviolet light. B) Bacterium B likely forms a slime layer better than Bacterium A. C) Bacterium B is likely to exhibit motility. D) Both bacteria may attach to surfaces.
In the lab you isolate a Chlorella mutant that is unable to switch xanthophyll pigments into the inactive, non-heat-dissipating form. If you released that mutant into a small pond shaded by trees, would the mutation spread, and why?
A. No, light absorbed by xanthophylls is not used to make ATP or NADPH. B. No, the xanthophylls prevent the production of reactive oxygen species. C. Yes, the xanthophylls prevent the production of reactive oxygen species. D. Yes, the heat released by the xanthophylls would warm up the cells and enhance photosynthesis. E. No, mutations never spread in nature.
The best terms for a fish whose body temperature varied between 4oC during the day when it is in deep, cold ocean waters and 26oC during the night when it comes to the surface to feed would be
A. ectothermic and endothermic. B. endothermic and homeothermic. C. ectothermic and homeothermic. D. ectothermic and heterothermic. E. endothermic and heterothermic.
When minute samples of DNA need to be genetically analyzed for identification purposes, which test can be effectively used?
A. Weil-Felix reaction B. Widal C. PCR D. Direct fluorescence antibody E. Western Blot