Which of the following is an agent or influence that causes developmental defects in an embryo?
a) Carcinogen
b) Toxin
c) Nicotine
d) Radiation
e) Teratogen
e
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Cells contain organelles called vaults which are thought to transport molecules synthesized in the nucleus such as mRNAs
Indicate whether the statement is true or false
A major difference between cardiac muscle cells and the cells in the cardiac conducting system is that the contractile cells do not undergo spontaneous depolarization.
Answer the following statement true (T) or false (F)
What is a functional group?
A) A functional group is the result of dissociation of organic molecules. B) A functional group is the final energy source in organic catabolism. C) A functional group is the complex created when an enzymes binds its substrate to complete a reaction. D) A functional group is a grouping of atoms that confer specific chemical properties to the rest of the molecule to which it is attached. E) A functional group is the specific grouping of atoms on a molecule to which enzymes can bind.
Helper T (TH) cells do not ________.
A. secrete fever-producing chemicals B. secrete cytokines that stimulate clonal selection of B cells C. secrete cytokines that stimulate macrophage activity D. secrete inflammatory chemicals E. secrete cytokines that stimulate clonal selection of cytotoxic T cells