subject
Biology, 07.12.2019 02:31 cupcake3103670

The chemical mechanisms used to avoid errors in protein synthesis are different from those used during dna replication. dna polymerases use a 3' to 5' exonuclease proofreading activity to remove mispaired nucleotides incorrectly inserted into a growing dna strand. there is no analogous proofreading function on ribosomes. instead, proofreading for protein synthesis is carried out by the aminoacyl-trna synthetases. ldentify the mechanisms aminoacyl-trna synthetases use to ensure that the correct amino acid is attached to the appropriate trna. to distinguish between two amino acids with similar structures, some aminoacyl-trna synthetases use a proofreading site that recognizes and hydrolyzes the incorrect amino acid. the active site in each aminoacyl-trna synthetase has a high specificity for the correct amino acid substrate. after binding the correct amino acid, an aminoacyl-trna synthetase recruits the appropriate trna to the active site by recognizing a number of sequences and structural features in a specific trna. aminoacyl-trna synthetases have an additional active site that binds to non-cognate trnas. the trnas that bind to this second active are hydrolyzed and released from the enzyme. first, the aminoacyl-trna synthetase binds to its cognate trna by recognizing a number of specific sequences and structural features in the trna. next, the synthetase-trna complex recruits the correct amino acid to the enzyme active site. aminoacyl-trna synthetases can rapidly hydrolyze the ester linkage between incorrectly paired rnas and amino acids

ansver
Answers: 3

Other questions on the subject: Biology

image
Biology, 21.06.2019 19:10, 1Angel2Got3Brains
Which statement about inheritance is true? o girls get most of their traits from their moms, boys get most of their traits from their dads. o male offspring will always have an x-linked genetic disease if the mom is a carrier o fathers always determine the gender of the offspring in humans. o males never have y chromosomes.
Answers: 3
image
Biology, 21.06.2019 22:10, penacesar18p9jrdh
What causes the force that pushes magma from the magma chamber through the pipe and vent of a volcano?
Answers: 1
image
Biology, 22.06.2019 14:00, fizz49
Some substances but not other can cross the (blank) membrane of a cell
Answers: 2
image
Biology, 22.06.2019 15:00, whitethunder05
Located at the epidermal-dermal junction of the skin. select all true statements about the transformation of melanocytes into abnormal cell
Answers: 3
You know the right answer?
The chemical mechanisms used to avoid errors in protein synthesis are different from those used duri...

Questions in other subjects:

Konu
Mathematics, 30.01.2020 17:54