What happens to an astronaut who spends 2 months in the weightless environment of a space capsule?
A) Bone density increases and muscle mass increases.
B) Bone density decreases and muscle mass increases.
C) Bone density decreases and muscle mass decreases.
D) Bone density increases and muscle mass decreases.
C
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Sulfur is an integral part of which of the following molecules?
A. vitamins B. enzymes C. amino acids D. proteins E. Sulfur can be an integral component of any of these molecules.
A(n) essential amino acid is one that the body cannot synthesize in sufficient amounts
__________________ Indicate whether the statement is true or false.
The cross section in the accompanying figure is representative of the internal structures found in:
a. phoronids. b. nemerteans. c. gastropods. d. flatworms. e. oligochaetes
If a person's blood type is A-, then the A antigen is found on that person's red blood cells and they also automatically have antibody that reacts with the Rh antigen.
a. true b. false