Prokaryotic cell mutations can be observed very quickly because the prokaryotic chromosome is
A. diploid.
B. polyploid.
C. haploid.
D. polysomal.
C
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Which of the following is the correct sequence of geological eras, going from oldest to most recent?
1.Cenozoic, Mesozoic, Paleozoic 2.Cenozoic, Paleozoic, Mesozoic 3.Mesozoic, Cenozoic, Paleozoic 4.Paleozoic, Mesozoic, Cenozoic
The study of the interactions of organisms and their physical environment is
a. biology. b. ecology. c. geology. d. paleontology. e. physiology.
When bound to ligand, this type of receptor changes conformation to allow ions to move down their concentration gradient across the membrane.
A. channel-linked receptor B. enzymatic receptor C. steroid hormone receptor D. G protein-coupled receptor
The ozone in the atmosphere can be damaged by which of the following?
A) carbon dioxide B) chlorine C) oxygen D) methane