When the lining of the small intestine secretes more water than the large intestine can absorb, what
develops?
a. colitis
b. constipation
c. diarrhea
d. Crohn's disease
e. Salmonellosis
C
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A mutation that results in the addition or deletion of a single nucleotide that radically changes the amino acid sequence of the resulting polypeptide is known as a ________ mutation.
Fill in the blank(s) with the appropriate word(s).
Cell shape is reinforced by ____
a. phospholipids
b. DNA c. cytoskeletal filaments d. transport proteins e. ribosomes
Which of the following is NOT true about the tempo of evolution?
a) Evolution always occurs gradually, with small changes over long periods of time. b) Rapid evolutionary changes by punctuated equilibrium proceed by a process different from natural selection. c) Scientific evidence now shows that gradualism, as proposed by Darwin, is wrong. d) Gaps in the fossil record mean that some creatures went extinct and then made a comeback. e) None of the above is true concerning the current view of the tempo of evolution.
Suppose a new species of bacterium is discovered. It contains a form of DNA pol III that can add new nucleotides to either the 5' end or the 3' end of an existing strand. All other properties of the enzyme remain unchanged. How would DNA replication in these bacteria differ from normal replication?
A. DNA gyrase would no longer be required for replication. B. Both new strands could be synthesized continuously like the leading strand. C. The same polymerase molecule could synthesize both strands at the same time. D. Helicase would no longer be required for replication.