A stomach cell is producing pepsin, an enzyme that hydrolyzes proteins. Which of the following events suggests that gene expression of pepsin has been turned off in the cell?
A) The pepsin protein is folded properly in the cytoplasm.
B) The chromosome with the pepsin gene is tightly coiled.
C) The pepsin mRNA leaves the nucleus and enters the cytoplasm.
D) Activators and RNA polymerases are abundant in the nucleus.
Answer: B
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DNA replication is
A) conservative. B) dispersive. C) semiconservative. D) irregular. E) none of the above
Four of the five answers below possess vascular tissue. Select the exception
a. whisk ferns b. mosses c. pine trees d. flowering plants e. horsetails
The Krebs cycle takes place in the
a. ribosomes. b. cytoplasm. c. nucleus. d. mitochondria. e. chloroplasts.
What inorganic precursors are needed to synthesize proteins?
A) carbon, water, and oxygen B) carbon, water, oxygen, and phosphate C) carbon, water, oxygen, nitrogen, and phosphate D) carbon, water, oxygen, nitrogen, and sulfur E) carbon, water, oxygen, sodium, and phosphate