Which of the following catalyzes the synthesis of ribosomal RNA in eukaryotes?
A) RNA polymerase I
B) RNA polymerase II
C) RNA polymerase III
D) Both RNA polymerase I and II
E) Both RNA polymerase I and III
E
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Indicate whether the statement is true or false
What is the target organ of thyroid hormones' metabolic effects?
A) anterior pituitary B) hypothalamus C) cells of the body D) thyroid
No matter what model is used to show community succession, the final stage is always
A. a community at equilibrium. B. a stable community. C. a secondary community. D. a climax community. E. a disturbed community.
Calcium ions are normally in higher concentrations outside most living cells than within cells. Which of the following processes is most likely responsible for this condition?
A) active transport B) facilitated diffusion C) osmosis D) simple diffusion