What are the functions of helper T cells?

What will be an ideal response?


They stimulate production and differentiation of both cytotoxic T and B cells, and the formation of memory T cells.

Biology & Microbiology

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Which developmental stage occurs first?

a. cleavage b. fetus c. gastrula d. zygote e. blastula

Biology & Microbiology

In the ABC model of flower development in

Arabidopsis thaliana, sepals form when gene(s) __________ is(are) switched on. a. A b. A and B c. B and C d. C e. A and B and C

Biology & Microbiology

Some eukaryotic DNA sequences act as introns in the cells of some tissues and exons in the cells of other tissues. This

is an example of ____, and allows for ____. a. positive control; feedback inhibition b. gene amplification; the regulation of the rate of transcription c. alternative splicing; the formation of different types of closely related proteins d. DNA methylation; the formation of different types of closely related proteins e. DNA replication; heterodimer formation

Biology & Microbiology

Plants often do not survive indoors because they lack adequate amounts of (Check all that apply)

A. light. B. carbon dioxide. C. water. D. minerals.

Biology & Microbiology