A point mutation that causes a premature stop codon is called a:
A. missense mutation.
B. nonsense mutation.
C. silent mutation.
D. frameshift mutation.
B
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An untied inflated balloon flies because
(a) the pressure is higher inside than outside the balloon. (b) the pressure is lower inside than outside the balloon. (c) air flows down its pressure gradient. (d) both a and c occur.
Saber teeth found in different groups of extinct carnivorous mammals are considered ___________ structures, as the fossil record shows that saber teeth evolved independently among the groups.
Fill in the blank(s) with the appropriate word(s).
During glycolysis, a six-carbon sugar is converted to
A. three two-carbon sugars. B. glucose. C. two pyruvic acid molecules. D. a disaccharide.
Charles Darwin wrote that members of the phylum ________ are particularly important for agriculture because they mix and aerate soil
A) Annelida B) Cnidaria C) Nematoda D) Arthropoda E) Platyhelminthes