The building blocks for the enzyme lactase are
a. proteins.
b. amino acids.
c. nucleic acids.
d. glucose molecules
B
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Which of the following statements is(are) true
concerning promoters? a. They are short sequences in DNA. b. They are locations in DNA where regulatory proteins gather. c. They control transcription. d. They are associated with specific genes. e. All of these are true
Each of the following is a voltage-gated Na+ channel property except
A) opens rapidly when stimulated. B) closes rapidly in absence of stimulus. C) opens to a variable extent depending on how much the stimulus voltage exceeds the threshold voltage. D) has a voltage sensor helix that controls channel gating. E) can be inactivated by the inactivating particle part of the channel protein.
Which hypersensitivity disorder is the result of cell-mediated response?
A. type I B. type II C. type III D. type IV E. both type I and II
Why is the phospholipid bilayer important to cell survival? Select the TWO answers that are correct.
A. It maintains homeostasis by forming an insulating layer around the cell. B. It separates the cellular environment from the external environment. C. It blocks small, nonpolar molecules from entering the cell and harming it. D. It anchors nucleotides together as they form molecules of DNA. E. It acts as a barrier for some, but not all, molecules on either side of it.