In an operon, the switch that controls mRNA synthesis is the promotor, which is a sequence of bases
upstream from the first structural gene.
__________________ Indicate whether the statement is true or false.
F, operator
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HIV infection and the subsequent destruction of which cell type is most devastating to overall immune system function?
A. cytotoxic T cells B. memory B cells C. helper T cells D. monocytes E. natural killer cells
Do you agree with the practice of engineering transgenic animals to be models of human disease? Why or why not?
What will be an ideal response?
Your roommate is experiencing heartburn and asks you to purchase her an antacid. Chemically speaking, how do you know that the antacid will help eliminate her pain?
A) It has a low pH to balance the acidity in her digestive tract. B) It is a buffer and will prevent the pH in her digestive tract from changing. C) It is probably high in H+. D) It has a higher OH- concentration to increase the pH in her digestive tract.
Which of the following is a negative regulator of the cell cycle?
a. cyclin b. human growth hormone (HCG) c. p53 d. cyclin-dependent kinase (Cdk)