What occurs during the antigen detection stage of the antibody-mediated immune response initiated by T cell activation?
a. Cytotoxic T cells destroy body cells that are infected with a pathogen
b. Helper T cells activate an antigen-specific B cell to divide and secrete antibodies.
c. A T cell displaying an antigen-specific T cell receptor (TCR) binds to the antigen on the surface of an antigen presenting cell.
d. Helper T cells are activated by the TCR.
e. A B cell degrades the pathogen and produces antigens.
c
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You purchase two identical houseplants and place them side by side on your windowsill. You water both plants equally. One plant, plant a, you leave alone. On the other plant, plant b, you inject florigen into the cells of the apical meristem. Which of the following would you expect to occur?
A. Both plants will produce flowers at the same time, but plant b will have more of them. B. Plant b will produce a flower at its apical meristem. C. Once the flower is gone, the apical meristem will develop again, and plant b will continue to grow from that stem. D. In subsequent years, plant b will only generate flowers in the same place. E. While flowering, the leaves will stop growing on plant b because florigen inhibitsleaf meristems. F. Once the flower is gone, plant b will grow taller, but only from growth of lateral meristems.
Recognition proteins, such as those embedded on the surface of red blood cells, are composed of
A) glycoproteins. B) phospholipases. C) nucleic acids. D) steroids.
Compare the rate of DNA replication in prokaryotes and eukaryotes
What will be an ideal response?
If you were told that concentrations of trace elements, above what is required by organisms, generally have no effect on those organisms, what would you say?
a. true b. false