Which of the following events initiates the process of exhalation?
A) Expansion of the lungs B) Relaxation of the diaphragm
C) Contraction of the diaphragm D) Contraction of the intercostal (rib) muscles
B
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Which of the following contributes to the extensive variability of immunoglobin genes?
A. The genes for the light-chain variable regions undergo rearrangement in germ-line cells. B. RNA transcripts from the recombinant genes undergo splicing that further changes the combinations in the final protein chains. C. The light chains generated by rearrangement and splicing can combine with the numerous heavy chains that have also undergone rearrangement and splicing. This results in even more variability in the final assembled antibody. D. The genes for the heavy-chain variable regions undergo rearrangement in germ-line cells. E. All of the choices given are correct.
Answer the following statements true (T) or false (F)
1. The penicillin molecule is an example of a hapten. 2. Autoimmune diseases are always the result of type II hypersensitivity reactions. 3. With respect to a particular pathogen, detection of antibodies in a patient's blood provides better proof of current infection than does detection of antigens. 4. If a person's immune system is not functioning properly, that person is said to be immunocompetent. 5. An IgM molecule can bind to 10 antigenic determinants, but they would all have to be the antigenic determinant that stimulated the production of that IgM molecule.
Write the equation that summarizes the aerobic respiration pathway
What will be an ideal response?
What products of light reactions of photosynthesis are used in the Calvin cycle?
A. glucose and oxygen B. carbon dioxide and water C. oxygen and protons D. ATP and NADPH E. ADP and NADP