A(n) absorption spectrum indicates the relative effectiveness of different wavelengths of light
__________________ Indicate whether the statement is true or false.
False - action spectrum
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Why would the loss of helper T cells due to HIV infection result in the immunodeficiency associated with AIDS?
A. Helper T cells are central to the activation of other parts of the immune system. B. Helper T cells are normally present in higher numbers, so their loss reduces the total number of immune cells. C. Without helper T cells, plasma cells would not secrete antibody. D. Infection of the helper T cells could lead to infection and loss of progenitor cells, thereby eliminating all immune cells.
Gametes are formed at stage ____
a. A b. B c. C d. D e. E
What type of bonding is responsible for maintaining the shape of the tRNA molecule?
A. van der Waals interactions between hydrogen atoms B. covalent bonding between sulfur atoms C. peptide bonding between amino acids D. hydrogen bonding between base pairs E. ionic bonding between phosphates
Too much exercise can impair the body's immune system and increase the risk of colds.
a. true b. false