You created a worm that expresses a human Bcl-2 transgene, and you are crossing the transgene into a homozygous ced-9 mutant background. However, you inadvertently used a clone of Bcl-2 with a mutation in the BH domain, which is essential for function. What results do you expect for the ced-9 mutants with the mutant Bcl-2 transgene?
A. All 1090 cells will live.
B. All 1090 cells will die.
C. 131 cells will die.
D. 959 cells will die.
Answer: B
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The redness and induration found after a tuberculin skin test involve the action of
A. sensitized T cells. B. IgE. C. complement. D. basophil cells.
Protists with contractile vacuoles
A. use them for motility. B. are algae. C. typically live in salty seawater. D. use them to expel excess water from the cell. E. All of these choices are correct.
The development of heart disease can result from a diet high in
A) fiber. B) protein. C) saturated fats. D) sugars.
Which of the following statements does not describe the leaf epidermis?
a. The cells all contain chloroplasts and photosynthesize. b. Some of the cells are modified to form trichomes. c. The cells are covered by a waxy cuticle. d. The cells are relatively transparent. e. It contains stomata, each of which is flanked by two guard cells.