How can so many antibody molecules be made in a relatively short period of time?
What will be an ideal response?
When an antigen binds to a TCR or an antibody on the surface of a T cell or B cell, it stimulates that cell to divide, producing a large population of genetically identical descendants, or clones, all with the same TCR or antibody. This process is called clonal selection.
The activated B cell divides to form two types of daughter cells. The first type is plasma cells, which synthesize and secrete 2,000 to 20,000 antibody molecules per second into the bloodstream. Plasma cells have cytoplasm filled with rough endoplasmic reticulum—an organelle associated with protein synthesis.
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________ convey information within the nervous system
Fill in the blank(s) with the appropriate word(s)
Figure 22.18
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Refer to the above figure for questions.
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Which numbered item in the above figure represents a female gametophyte?
A. 1 B. 2 C. 3 D. 4 E. 5
_____ and ________ are tumor suppressor genes.
Fill in the blank(s) with the appropriate word(s).
Which of the following achieves sterilization in the shortest period of time?
A. autoclaving B. boiling C. batch method pasteurization D. an oven at 171°C E. ultra-high-temperature sterilization