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