Which of the following would cause relaxation of precapillary sphincters?
A) sympathetic activity
B) vasopressin
C) carbon dioxide
D) epinephrine
E) parasympathetic activity
Answer: C) carbon dioxide
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Which of the following statements about stem cells is NOT accurate?
A. Stem cells can undergo mitosis. B. Some stem cells can differentiate into more than one type of specialized cell. C. Different types of stem cells vary in their potency. D. Stem cells are only found in embryos. E. Some stem cells can only differentiate into one cell type.
Which two components of blood involve the formation of clots?
a. albumin and fibrinogen b. albumin and leukocytes c. fibrinogen and erythrocytes d. fibrinogen and platelets e. platelets and albumin
Covalent modification
A) can activate an enzyme. B) affects the activity of an enzyme by adding or removing a chemical group. C) can involve the addition of phosphate groups. D) produces modifications that can sometimes be reversed. E) All of these are correct.
A restriction enzyme is most comparable to a ___________
A. screwdriver D. fork B. hammer E. ruler C. pair of scissors