As DNA polymerase synthesizes a new phosphodiester bond, all the following occur except:
A. amino acid residue extracts H+ from 3' hydroxyl of deoxyribose.
B. oxygen of 3' hydroxyl attacks ? phosphoryl group of nucleoside triphosphate.
C. phosphate is displaced and protonated by an acidic amino acid residue.
D. hydrogen bonds between DNA strands help position nucleotides.
E. metal ions lower pKa within the active site to facilitate base catalysis.
C
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Transcriptional regulation in eukaryotic cells requires the coordinated action of many proteins that interact with one another and with DNA sequences near the gene
A. true B. false
The special kind of fault along where different ocean plates are moving laterally away from each other is called:
a. trench. b. midocean. c. transform. d. arc. e. convergent.
Which of the following is a behavioral response to environmental variability?
A) migrating to a different location B) acclimation C) endothermy D) "flagging" by trees
Which blood vessel of the pulmonary circuit will carry deoxygenated blood?
A. pulmonary vein B. aorta C. vena cava D. pulmonary artery E. All of these carry deoxygenated blood.