The large intestine
a. contains bacteria that makes vitamins we
need.
b. absorbs water that was not absorbed by the
small intestine.
c. concentrates indigestible material into
feces.
d. absorbs water that was not absorbed by the
small intestine and concentrates indigestible
material into feces.
e. does all of these
E
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The answer set for this question shows a series of short amino acid sequences obtained from a protein. If you were faced with choosing one of these to design a probe for a particular gene, which would provide the simplest probe or probe set?
(To answer this question, consult the codon table shown in the figure above.) A) leucine-leucine-serine-leucine B) leucine-serine-proline-proline C) proline-methionine-proline-leucine D) tryptophan-methionine-tryptophan-tryptophan
Low density lipoproteins
a. carry cholesterol to the liver. b. line the artery walls. c. are used for nutrition. d. lower blood pressure. e. carry cholesterol and other fats to body cells.
Through the process of cell differentiation ________.
A) each cell develops a characteristic set of structural features B) each cell becomes capable of performing all vital functions C) cells in nearby locations become unable to work together D) each cell becomes able to change its function throughout its life cycle E) None of the answers are correct.
Which piece of evidence would strongly support the RNA-first hypothesis?
A. discovering a way to make RNA more stable than DNA B. being able to build microspheres that contain only protein and RNA C. finding a mechanism whereby proteins could assemble DNA out of free nucleotides D. finding a protocell that could carry on metabolism as well as reproduce E. finding a living organism that uses RNA as its genetic material