B cells interacting with helper T cells are stimulated to differentiate when _____
A) B cells produce IgE antibodies
B) B cells release cytokines
C) cytotoxic T cells present the class II MHC molecule-antigen complex on their surface
D) helper T cells differentiate into cytotoxic T cells
E) helper T cells release cytokines
Answer: E
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A. mucus, acid, and saliva B. secretory IgA and lysozyme C. GALT (gut-associated lymphoid tissue) D. peristalsis E. All of the choices are correct.
What term describes all alleles of all the genes in a population?
a. genome tree b. genetic family c. gene reservoir d. gene pool e. allele collection
When is cell-to-cell communication particularly important in regulating gene expression?
A. During meiosis B. During mitosis C. During replication D. During embryonic development
Life gains most of its energy from:
A) carbon dioxide. B) sugar molecules. C) oxygen. D) sunlight. E) carbohydrates.