Two-thirds of the plasma proteins are
a. chitin.
b. keratin.
c. elastin.
d. albumin.
e. glycoproteins.
D
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The chelicerates (select all that apply)
A. include spiders, scorpions, and their relatives. B. are known for their venoms. C. were among the first animals to invade land around 400 million years ago. D. have pincer-like claws, antennae, and wings. E. are ecologically diverse, particularly in their food habits, with different groups specializing on a wide variety of plant and animal foods.
Which of the following statements is
INCORRECT?
a. Enzymes remain unchanged after a reaction. b. Like enzymes, many coenzymes remain unchanged after a reaction. c. Cofactors are atoms or molecules other than proteins that interact with enzymes. d. Coenzymes are organic molecules that interact with enzymes. e. Activity of enzymes may also be affected by the concentration of salt
Adaptations include all of the following EXCEPT
A) larger body size in male gorillas, which fight over females. B) inborn migratory behavior of young birds born in the Arctic. C) reduced heart rate and oxygen consumption in seals that dive deep for long periods of time. D) teaching a pet parrot to talk.
Which of the following brings tRNA with an amino acid close enough to mRNA to permit interaction and the assembly of amino acids to form a protein?
A) DNA polymerase B) mRNA C) RNA polymerase D) ribosome