Which system is considered a closed system?
a. a human
b. a gas-powered automobile
c. a single-celled organism
d. a propane furnace
e. the Earth
ANSWER: e
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The hemocyanin of arthropods and molluscs differs from the hemoglobin of mammals in that _____
A) the oxygen dissociation curve for hemocyanin is linear B) hemocyanin carries appreciably more carbon dioxide C) hemocyanin has protein coupled to copper rather than to iron D) the protein of hemocyanin is not bound to metal E) hemocyanin includes cyanic acid
A person who is homozygous for a mutation of the phenylalanine hydroxylase gene
A. can lead a normal life if the environment is controlled. B. cannot give blood. C. will always develop mental retardation in early infancy. D. will require phenylalanine supplements throughout life. E. Two statements are correct. They can lead a normal life if the environment is controlled by taking phenylalanine supplements.
All protists
A. are prokaryotes. B. lack a nucleus. C. lack membrane-bounded organelles. D. are eukaryotes. E. are multicellular.
If the mRNA base is uracil, the complementary base in translation is
A. thymine. B. cytosine. C. adenine. D. uracil.