In addition to the clonal deletion of self-reactive T cells that occurs during embryonic development, autoreactivity of T cells and B cells is also inhibited by T ________ cells.

What will be an ideal response?


regulatory, cytotoxic, anergic, helper

Biology & Microbiology

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An enzyme that cleaves internal phosphodiester bonds of a DNA molecule is a (n)

A. ligase. B. exonuclease. C. methylase. D. endonuclease.

Biology & Microbiology

What problems are associated with desalination?

What will be an ideal response?

Biology & Microbiology

Which of the following is NOT a source of

heritable variation in traits among individuals of a population?

a. mutation b. crossing over c. independent assortment d. fertilization e. mitosis

Biology & Microbiology

Phloem sieve-tube elements are able to remain alive because adjacent ________ cells provide nourishment in the form of proteins and high-energy compounds such as ATP

Fill in the blank(s) with correct word

Biology & Microbiology