The essential amino acids
A) must be obtained from the food we eat.
B) are found only in green, leafy vegetables.
C) are essential as an energy source.
D) are required for making nucleic acids.
Answer: A
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How do the antibodies of sharks differ from those of mammals?
a. Shark antibodies do not have light chains. b. Shark antibodies do not have heavy chains. c. Shark antibodies have a different arrangement of embryonic gene segments. d. Shark antibodies are produced without rearrangement of gene segments. e. Shark antibodies have light, heavy, and moderate chains.
Which of the following best describers the reduction of the coenzyme NAD?
What will be an ideal response?
Which component of a negative feedback mechanism is responsible for producing the result that counteracts the original environmental change away from homeostasis?
a. an integrator b. a sensor c. an effector d. a stimulus
Photosystem II generates ________, and photosystem I generates ________, both of which are required by the light reactions
Fill in the blank(s) with correct word