What characteristic is unique to echinoderms?
A) a lack of segmentation
B) a water vascular system
C) radial symmetry
D) larvae with bilateral symmetry
B
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Oligomycin is an antibiotic that binds ATP synthase, blocking the flow of protons through the enzyme's proton channel. In addition to preventing synthesis of ATP, what additional effect might you expect in response to the presence of oligomycin?
A. higher pH in the intermembrane space B. lower pH in the intermembrane space C. a buildup of protons in the mitochondrial matrix
What would result from a single nucleotide deletion (point mutation) within the coding sequence of a structural gene?
A. a silent point mutation with no deleterious effects B. a missense point mutation resulting in the change of one amino acid C. a nonsense point mutation resulting in the generation of a premature stop codon D. a frameshift mutation, producing a different amino acid sequence altogether E. All of the choices are possible.
Isotopes of the same element differ from each other in the number of
a. electrons and protons. b. neutrons only. c. protons and neutrons. d. electrons only. e. protons, neutrons, and electrons.
Animals grow mainly by increasing the number of body cells, plants grow mainly by increasing cell
size.
Indicate whether the statement is true or false.