How are helper T cells involved in a clonal population of appropriate B cells?
What will be an ideal response?
Helper T cells become activated by foreign antigen, and then interact with B cells that have also bound themselves to the foreign antigen. The helper T cells produce interleukins, which cause the B cell to produce hundreds of thousands of identical (clonal) B cells that now have the ability to produce a great amount of the antibody necessary to quell the infection.
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If a monohybrid cross results in 1:2:1 genotypic and phenotypic ratios in the offspring, then which type of inheritance
might be at work?
a. dominance b. incomplete dominance c. epistasis d. pleiotropy e. polygenic inheritance
In colder regions, some macroalgae die off in winter, but others termed ____ live for at least 2 years
a. perennials b. annuals c. eurythermals d. stenothermals e. biannuals.
Experiments like those performed by Stanley Miller in the 1850s demonstrated that lightening fueled atmospheric
reactions could produce ____.
a. self-replicating DNA molecules b. organic compounds required for life under artificial conditions c. prokaryotic cells under artificial conditions d. meteorites containing the building blocks of life e. organic molecules in hydrothermal vents
According to the phylogenetic tree above, fungi are more related to:
a. land plants. b. ambozoa. c. red algae. d. metazoans. e. bacteria.