From which of the following layers of the developing embryo do the eyes develop?
a) endoderm
b) mesoderm
c) ectoderm
d) more than one layer contributes
e) none of these choices
c
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Natural killer (NK) cells ________
A) can kill cancer cells before the immune system is activated B) are also called cytotoxic T cells C) are cells of the adaptive immune system D) are a type of phagocyte
A cell that is permeable to Solute X is placed into solution containing a higher concentration of X. Diffusion occurs until equilibrium is attained. At this time,
A) there is no further movement of Solute X across the membrane. B) there is no further change in concentration of Solute X. C) Both of the statements are correct. D) Neither of the statements is correct.
In the following chemical reaction, what is NaCl?
NaOH + HCl ? NaCl + H2O
As blood travels from the aorta to the capillaries, blood pressure gradually increases
a. true b. false