What is the immediate effect of ligand binding to a ligand-gated channel?
A. the flow of ions into or out of the cell
B. a conformational change of the channel
C. the activation of kinase proteins
D. the formation of cyclic AMP
B
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The depolarization of the heart is initiated by the
A. left and right bundle branches. B. bundle of HIS. C. atrioventricular node. D. Purkinje fibers. E. sinoatrial node.
Which event is associated with leaf abscission?
a. Chlorophyll breaks down. b. Anthocyanins degrade. c. Carotenoids are transported from the leaves. d. Sugars accumulate in the leaves. e. Leaves turn dark green.
Which of the following statements about DNA structure is false?
A: It is antiparallel. B: It has a uniform diameter. C: It is a double-stranded helix. D: The 3´end is phosphorylated. E: It is a right-handed helix.
These enzymes have the ability to cut DNA at places where specific sequences of nucleotides occur.
A. restriction B. ligases C. helicases D. polymerases