Why is heating a first step in pcr amplification of extracted dna?
the enzyme dna polymerase works at a higher temperature.
it permits hydrogen bonds between dna strands to dissociate.
the nucleotides bind together at high heat.
it is required for primers to bind permanently to the dna.
it is necessary for dna strands to anneal to each other.

Option). It permits hydrogen bonds between DNA strands to dissociate.

Explanation:

PCR (polymerase chain reaction) techniques can bed defined as a technique, which is used for in vitro amplification of sample DNA. It is made up of three steps, denaturation, primer annealing, and extension.

The first step in PCR is heating of sample DNA to denature the double stranded DNA by breaking hydrogen bonding present between bases of double stranded DNA.

Due to this, double strands of DNA get separated and provide templates for synthesis of daughter DNA strands.

Thus, the correct answer is second option.

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.

i believe it is c: genes for body color and wing size are inherited separately from each parent.