Which statement is NOT true of the T cells?
A. T cells require presentation of antigens by macrophages before they are able to recognize the antigen.
B. T cells change into plasma cells and produce antibodies when stimulated.
C. T cells mature in the thymus.
D. T cells carry receptor molecules on their cell surfaces.
Answer: B
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What kind of eye color would be expressed in male progeny from a white-eyed female and a red-eyed male?
A. All males would have red eyes. B. All males would have white eyes. C. Half of the male progeny would have red eyes and half of the male progeny would have white eyes (1:1 ratio of eye color in males).
All life can be divided into _____ domains and _____ kingdoms
a. three; three b. four; four c. three; four d. four; three
The various energy levels in an atom of magnesium ( 12
24 Mg) have different numbers of electrons. Use the following numbers to answer questions 68–70. a. 1 b. 2 c. 3 d. 6 e. 8 D 68. number of electrons in the first energy level D 69. number of electrons in the second energy level D 70. number of electrons in the third energy level
Which of the following organisms first introduced oxygen into Earth's atmosphere?
A) cyanobacteria B) methanogens C) early protozoans D) plants E) green algae