How is the net primary productivity of an ecosystem calculated?
What will be an ideal response?
ANSWER: The energy used for cellular respiration is subtracted from the gross primary productivity.
Gross primary productivity is the rate that plants convert solar energy into chemical energy.
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The vaccines that are used to protect people from diphtheria and tetanus are:
A) antitoxins. B) attenuated vaccines. C) inactivated vaccines. D) toxoids.
Why can sickle cell disease cause death?
a. The malformed red blood cells cannot transport oxygen. b. The malformed red blood cells cannot enter capillaries and, in fact, block them. c. The malformed blood cells assume a sickle-shape. d. The patient has two copies of the mutant gene. e. More cells assume the sickle shape as oxygen concentration in the tissues falls.
The left hemisphere of the cerebrum deals mainly with
a. speech b. analytical skills c. mathematics d. a and b only e. a, b and c
Endospores are
A. metabolically inactive. B. resistant to heat and chemical destruction C. resistant to destruction by radiation. D. All of the other choices are correct. E. living structures.