Which of the following statements about T-cells is NOT correct?
A) Lymphoid precursor cells migrate into thymus and mature into T-cells.
B) TH Cells produce granzyme and perforin to lyse the target cells in the adaptive immune responses. C) More than 99% of T cells die in thymus during colony selection.
D) T cells undergo both positive and negative selections during maturation.
E) T cell receptors contain both variable domain and constant domain.
Ans: B) TH Cells produce granzyme and perforin to lyse the target cells in the adaptive immune responses. C) More than 99% of T cells die in thymus during colony selection.
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Which cells make up nervous tissue?
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The tectorial membrane is
a. connective tissue. b. epithelial tissue. c. muscle tissue. d. nervous tissue. e. a jellylike substance.
All known organisms appear to translate genetic information to protein molecules via the same genetic code. This finding strongly supports the hypothesis that __________.
a. all organisms are descended from a single common ancestor b. there's only one possible way to encode information in a macromolecule c. the genetic code is of relatively recent evolutionary origin d. scientists have yet to accurately decipher the genetic code e. None of the listed responses are correct.