Touchdown  PCR is initiated at very high annealing temperatures, which allow only perfectly matched primer-template DNA hybrids to form and support amplification. The annealing temperature is dropped in a stepwise fashion with each cycle of PCR. 

TLS Online TPP Program

#Id: 3596

#Unit 3. Fundamental Processes

Nirenberg and Matthaei therefore concluded that the triplet codon UUU encodes phenylalanine, poly(C) proline (polyproline), polyadenylate, poly(A), encodes polylysine.

TLS Online TPP Program

#Id: 3597

#Unit 3. Fundamental Processes

“Dictionary” of amino acid code words in mRNAs.

TLS Online TPP Program

#Id: 3599

#Unit 3. Fundamental Processes

The third base of each codon plays a lesser role in specifying an amino acid than the first two.

TLS Online TPP Program

#Id: 3600

#Unit 3. Fundamental Processes

All the amino acids except methionine and tryptophan have more than one codon.

TLS Online TPP Program

#Id: 3601

#Unit 3. Fundamental Processes

In most cases, codons that specify the same amino acid differ only at the third base.

TLS Online TPP Program

#Id: 3603

#Unit 3. Fundamental Processes

All the codons will be formed with equal frequency if the ratio of A:T:G:C is 1:1:1:1 concentration in the cell.