Macromolecules are made up of smaller subunits called
A. Monomers
B. Polymers
C. Isomers
D. Cells
E. Aggregates
Answer: A. Monomers
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When the gene for rat growth hormone was injected
into mouse eggs, a. they were subsequently implanted unsuccessfully into female mice. b. a third of the offspring of the surrogate mothers grew much lager than their littermates. c. the rat gene integrated into the mouse DNA, but did not express itself. d. the rat gene failed to integrate into the mouse DNA. e. all of the offspring of the surrogate mothers grew much larger than their littermates.
The lining of the gut and the stomach, liver, and
pancreas are produced by a. the ectoderm. b. the endoderm. c. the mesoderm. d. two of the germ layers. e. all of the germ layers.
Which one of the following is false concerning the molecule below?
A. This molecule represents a major component of cell membranes.
B. This molecule is a lipid.
C. This molecule was formed by dehydration synthesis.
D. This molecule is composed of amino acids.
Which of the following is likely to have the lowest concentration of O2?
A) warm salt water B) cool salt water C) cool fresh water D) warm fresh water