Which of the following is found in the general circulation?
a. lymphoid stem cells
b. megakaryocytes
c. platelets
d. pluripotent stem cells
e. myeloid stem cells
ANSWER: c
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Which of the following statements is true regarding the systemic acquired resistance (SAR) response in plants? Select all correct choices
A. It is pathogen-specific. B. It relies on salicylic acid. C. It is only effective against biotrophic pathogens. D. It requires dead tissue.
The outer nuclear membrane is contiguous with
a. the endoplasmic reticulum. b. the nuclear lamina. c. the Golgi apparatus. d. the plasma membrane.
When the pollen of one plant species will not germinate on the flower of another species, it is an example of
A) temporal isolation. B) hybrid inviability. C) hybrid infertility. D) hybrid vigor. E) gametic incompatibility.
If an enzyme catalyzes the reaction A + B ? C, then
A. the enzyme could also convert A + B to another molecule D. B. the enzyme will also catalyze the reaction C ? A + B C. the enzyme undergoes a conformational change when bound to A and B. D. the enzyme energizes A and B to make them more reactive. E. the active site of the enzyme binds C more tightly than A and B.