By Dr Ananya Mandal, MD. Leptin is a protein hormone involved in the regulation of energy intake and expenditure by the body. Leptin is an important cytokine that plays a key role in the regulation of appetite, food intake and metabolism.y Dr Ananya Mandal, MD. Leptin is a protein hormone involved in the regulation of energy intake and expenditure by the body. Leptin is an important cytokine that plays a key role in the regulation of appetite, food intake and metabolism.
Report Abuse. PCR The polymerase chain reaction (PCR) is a technique widely used in molecular biology. It derives its name from one of its key components, a DNA polymerase used to amplify a piece of DNA by in vitro enzymatic replication.As PCR progresses, the DNA thus generated is itself used as template for replication. This sets in motion a chain reaction in which the DNA template is exponentially amplified.With PCR it is possible to amplify a single or few copies of a piece of DNA across several orders of magnitude, generating millions or more copies of the DNA piece.ith PCR it is possible to amplify a single or few copies of a piece of DNA across several orders of magnitude, generating millions or more copies of the DNA piece.
What are the four main components of a PCR DNA amplification reaction? DNA template, Taq DNA polymerase, oligonucleotide primers, and nucleotides 2. What is the name for the first step of thermal cycling? ___ denaturing _______________ 3. Describe what occurs during this first step.owever, PCR is different in two major ways. First, PCR only copies a specific region of DNA (rather than your entire genome). And second, it makes millions of copies of DNA (rather than just one). PCR is an incredibly powerful tool that scientists use to analyze DNA.