During replication, DNA polymerase inserts cytosine instead of thymine This is a
ID: 175659 • Letter: D
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During replication, DNA polymerase inserts cytosine instead of thymine This is a type known as A) genotype - thymine dimer formation base substitution - transversion mutation - transition phenotype - neutral mutation dismutation - base substitution The degeneracy of the genetic code helps to minimizes the effects of refers to the wobbling of the ribosomal complex along the mRNA determines the tRNA anti-codon bond with the mRNA codon is responsible for intervening sequences refers to the introns and exons of the DNA Transcription is inhibited as long as the is bound to the region of the operon. catabolite activator protein - inducer inducer - promoter repressor - operator RNA polymerase - structural gene none of the above = identify An amino-acyl synthetase is responsible for formation of a peptide bond attaching an amino group to an organic acid causing a peptide chain to form secondary and higher structural organizations movement of tRNA molecules from A to P sites on a ribosome joining an amino acid to a tRNAExplanation / Answer
6. Dna polymerase adds cytosine instead of thiamine.
C) Mutation- Transition.
The substitution of one base pair for another is the a common type of mutation. Two types of substitutions are possible. A transition is the replacement of one purine by the other or that of one pyrimidine by the other. In contrast, a transversion is the replacement of a purine by a pyrimidine or that of a pyrimidine by a purine.
7.A) helps to minimize effect of mutation. If a mutation caused a change in one three-nucleotide-base sequence, the result would most likely be something meaningless, which would terminate the production of the protein. To avoid this, all combinations are used. That way mutations don’t stop the protein from being produced. It might change the amino acid that is used, which might change the protein a bit, but at least the protein would still be produced. As a result, there would be a chance for it to continue to do its job.Thus, degeneracy minimizes the deleterious effects of mutations.
8.C) Repressor- Operator. In the lac operon, allolactose binds to the repressor protein, allowing gene transcription, while in the trp operon, tryptophan binds to the repressor protein effectively blocking gene transcription. In both situations, repression is that of RNA polymerase transcribing the genes in the operon.
9. E) joing an amino acid to tRNA. An aminoacyl tRNA synthetase (aaRS) is an enzyme that attaches the appropriate amino acid onto its tRNA. It does so by catalyzing the esterification of a specific cognate amino acid or its precursor to one of all its compatible cognate tRNAs to form an aminoacyl-tRNA
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