The chemical name for table salt is sodium chloride, or simply NaCl. What type of chemical is NaCl?
A) Compound
B) Element
C) Molecule
D) Ion
A
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According to the clonal selection theory
A. antibodies are modified, at the time of antigen exposure, to specifically react with the antigen. B. self-reactive T cells are killed in the thymus. C. B cells producing autoantibodies are eliminated in the thymus. D. each B cell is already programmed to produce a specific antibody. E. self-reactive T cells are killed in the thymus AND B cells producing autoantibodies are eliminated in the thymus.
Which organ releases hormones that assist with the development of the immune system and continues to shrink as an individual matures and ages?
a. thymus b. thyroid c. thalamus d. testes
Why has C. elegans proven to be a useful model for understanding apoptosis?
A) The animal does not naturally use apoptosis, but can be induced to do so in the laboratory. B) The nematode undergoes a fixed and easy-to-visualize number of apoptotic events during its normal development. C) This plant has a long-studied aging mechanism that has made understanding its death just a last stage. D) While the organism ages, its cells die progressively until the whole organism is dead.
Carbon dioxide is transported in the blood in all of the following ways EXCEPT
a. disolved in plasma b. combined with hemoglobin c. as bicarbonate ions d. by white blood cells