A lac repressor turns off the expression of the lac genes by
a. Binding to the promoter
b. DNA polymerase
c. Binding to the operator
d. Binding to the lac genes
Ans: c. Binding to the operator
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A unique characteristic of plant cells is their
a. ability to photosynthesize. b. ability to carry out cellular respiration. c. ability to continuously grow and generate new organs throughout their life cycle. d. ability to form defensive compounds. e. ability to protect themselves through movement
The four major groups of organic compounds are
A. carbohydrates, proteins, amino acids, and nucleic acids. B. fats, waxes, carbohydrates, and amino acids. C. carbohydrates, lipids, steroids, and monosaccharides. D. carbohydrates, lipids, proteins, and nucleic acids. E. lipids, fats, waxes, and steroids.
Which of the following can cause vasoconstriction?
A) increase in carbon dioxide B) increase in histamine C) increase in osmolarity D) release of nitric oxide E) angiotensin II
A receptor potential is a(n) all-or-none response
__________________ Indicate whether the statement is true or false.