Most null cells are destined to become what type of cell?
A) mast cells
B) plasma cells
C) effector cells
D) natural killer cells (NK cells)
E) dendritic cells
Ans: D) natural killer cells (NK cells)
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What are the three strategies for defending against foreign organisms, cells, or molecules?
What will be an ideal response?
Leprosy destroys nerve tissue, so an afflicted person is likely to hurt his or her foot without even knowing it. Which types of neurons are likely to be affected?
A) neuroglial cells B) motor neurons C) sensory neurons D) interneurons
An enzyme ____ the activation energy required for a chemical reaction.
A) increases B) lowers C) converts D) catalyzes
Who discovered that DNA was the genetic material or transforming factor that could convert nonvirulent R-type Streptococcus pneumoniae bacterium to the virulent S-type?
A. Hershey and Chase B. Weismann and Nageli C. Avery, MacLeod, and McCarty D. Watson, Crick, Wilkins, and Franklin E. Griffith