All of the following are true of the natural killer cells
(NK cells) EXCEPT that they
a. are most active in innate responses.
b. are central to adaptive immunity, like B and T
cells.
c. alert the immune system to the presence of
antigens.
d. kill weakened or dying body cells.
e. combat viral infections and cancer.
Answer: c
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Answer the following statements true (T) or false (F)
1. Animal biomass exceeds plant biomass in most ecosystems. 2. The amount of CO2 in the atmosphere is stable over a period of one year. 3. Insect densities tend to decrease in elevated CO2, all other factors being equal. 4. Biomagnification results in an increased concentration of bioaccumulated chemicals as one moves from upper to lower trophic levels.
Which of the following changes take place as the muscle contracts?
A) The Z lines get closer together. B) The H zones get smaller. C) The I band gets smaller. D) The A band gets smaller. E) A, B, and C are correct.
Capsular
What will be an ideal response?
An opening in leaves that functions in the exchange of gases is called a ____.
A. cuticle B. stoma C. guard cell D. pit E. pore