Which of the following are defined as compounds that have biological activities similar to those of trans-zeatin

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#Question id: 1980

#Unit 4. Cell Communication and Cell Signaling

For one person to produce over a million different antibody molecules could not possibly require over a million different genes. Instead, this variability is accounted for by which processes?

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#Question id: 1981

#Unit 4. Cell Communication and Cell Signaling

Which of the following is accounted for by immunological memory?

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#Question id: 1982

#Unit 4. Cell Communication and Cell Signaling

These cells are involved in cell-mediated immunity, and they respond to class I MHC molecule-antigen complexes:

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#Question id: 1983

#Unit 4. Cell Communication and Cell Signaling

These cells are involved in innate immunity, and a person lacking these cells may have a higher than normal chance of developing malignant tumors:

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#Question id: 1984

#Unit 4. Cell Communication and Cell Signaling

Which of the following is a pathway that would lead to the activation of cytotoxic T cells?

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#Question id: 1985

#Unit 4. Cell Communication and Cell Signaling

Which of the following is the last line of defense against an extracellular pathogen?