A mutation occurs that changes a C to a T in DNA such that, in the mRNA transcribed from this piece
of DNA, a UGG codon is changed to UGA. This mutation is a
A. substitution mutation.
B. missense mutation.
C. nonsense mutation.
D. substitution mutation and a missense mutation.
E. substitution mutation and a nonsense mutation.
E
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Why does ice float in liquid water?
A) The high surface tension of liquid water keeps the ice on top. B) The ionic bonds between the molecules in ice prevent the ice from sinking. C) Ice always has air bubbles that keep it afloat. D) Stable hydrogen bonds keep water molecules of ice farther apart than water molecules of liquid water. E) The crystalline lattice of ice causes it to be denser than liquid water.
Flatworms have specialized cells called ____ that serve as a simple excretory system
a. choanocytes b. polyps c. cnidocytes d. flame cells e. tentacles
Solenopsis invicta or red imported fire ants
(RIFAs) are extremely successful in the United States because they
a. are resistant to attacks from predators. b. are resistant to most pesticides. c. never get troubled with diseases. d. are resistant to attacks from predators and never get troubled with diseases. e. have all of these characteristics
Genes are located on ________
A) chromosomes B) the cytoplasm C) mitosis D) the centromere