Hemoglobin contains which element?
a. chlorine
b. sodium
c. iron
d. copper
e. magnesium
Answer: c
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Cell shapes are largely determined by:
A. cytoskeletal protein networks in the cytoplasm. B. adhesion proteins that assemble at cell surfaces. C. a mesh of proteins and polysaccharides in the extracellular matrix. D. cytosolic proteins that assemble into structures called cellular junctions. E. All of these choices are correct.
The chance that an individual in the United States will experience some form of cancer in his or her lifetime is
A) 1 in 3. B) 1 in 10. C) 1 in 25. D) 1 in 1,000. E) 1 in 10,000.
Which of the following statements is NOT true?
a) The opening of stomata increases transpiration. b) The stomata of a wilted plant are open. c) Plants may release carbon dioxide through the stomata. d) Stomata may be closed during the day.
What is a key characteristic of enzyme behavior?
A. Enzyme shape is stable during catalysis. B. The active site of an enzyme orients its substrate molecules, thereby promoting interaction of their reactive parts. C. All enzymes have an active site where coenzymes are temporarily bound. D. Each enzyme can catalyze multiple types of reactions. E. Enzyme activity is not affected by pH and temperature.