An animal cell placed in a hypertonic solution will swell and perhaps burst
Indicate whether the statement is true or false.
ANSWER: False - hypotonic
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How is the control of gene expression different between methylation of histone proteins and direct methylation of DNA?
What will be an ideal response?
As blood glucose levels fall below normal, ____
a. insulin secretion stops b. glucagon secretion increases c. the beta cells of the pancreas are stimulated d. glucose is converted to glycogen in the liver e. somatostatin levels rise
Systems in which feedback from changes in one direction elicit compensatory effects in the opposite direction.
What will be an ideal response?
Which of the following statements about T lymphocytes is FALSE?
A) T lymphocytes produce antibody molecules. B) T lymphocytes directly attack cells and produce the cell-mediated immune response. C) T lymphocytes are called such because they mature in the thymus. D) T lymphocytes have TCRs that recognize antigen only if it is bound to MHC. E) There are three types of T lymphocytes.