A stimulus that is too weak to depolarize the membrane to threshold produces an action potential that is weaker than normal
Indicate whether the statement is true or false
F
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Which statement is true about T cells?
A) They will develop into cytotoxic T cells if antigen is complexed with class II MHC proteins. B) Once activated, they cannot secrete cytokines. C) Their proliferation is enhanced by interleukins 1 and 2. D) They usually directly recognize antigens, which then activates a subpopulation of killer cells.
Using the figure below, identify the labeled part.
1) Label A: ______________________________
2) Label B: ______________________________
3) Label C: ______________________________
4) Label D: ______________________________
5) Label E: ______________________________
6) Label F: ______________________________
7) Label G: ______________________________
8) Label H: ______________________________
9) Label I: ______________________________
10) Label J: ______________________________
11) Label K: ______________________________
12) Label L: ______________________________
13) Label M: ______________________________
14) Label N: ______________________________
15) Label O: ______________________________
16) Label P: ______________________________
17) Label Q: ______________________________
18) Label R: ______________________________
19) Label S: ______________________________
What is the function of ATP molecules in living cells?
A) They capture energy from the oxidation of fuels in their high-energy phosphate bonds, and the energy is used in various cell processes. B) They act as coenzymes so that fats can be synthesized. C) They form a genetic material. D) They are an integral part of the cell membrane, important in transporting water molecules.
How many globins (protein building blocks) are found in a single hemoglobin molecule?
A. 1 B. 2 C. 4 D. 6 E. 8