Answer:
1- Test tube with DNA sample is placed in machine
2- DNA sample is heated
3- DNA denatures
4- Taq polymerase initiates DNA synthesis
5- Double-stranded DNA is produced
Explanation:
The Polymerase Chain Reaction (PCR) is a technique widely used in molecular biology laboratories in order to produce many copies of a specific DNA sample. Thermocyclers are machines designed for a cyclic temperature change of the PCR. First, an initial denaturation step where DNA sample is heated to separate the double-stranded DNA into two single strands. Subsequently, 20-40 PCR cycles are repeated to produce millions of copies of a specific DNA sequence. There are three steps in each PCR cycle: 1-Denaturation to 94–98 °C (DNA strands are separated), 2-Annealing to 50–67 °C (primers bind to each DNA strand on the opposite ends of the DNA strands to be copied) and 3-Extension to 75–80 °C (Taq polymerase initiates the synthesis of complementary DNA strands).
Answer: B. <em>The nucleus</em>
Explanation:
"Their nuclei are unstable, so they break down, or decay, and emit radiation."
{please give me brainliest :)}
The difference between phylum and divisions is....Phylum is part of the animal kingdom, it is not fungi,New classification for Protista,term created by Haeckel,and includes heterotrophs.
Division is part of the plant kingdom, for fungi,old classification for Protista,created by Eichler and includes autographs and saprotrophs. They have different kingdoms,ones fungi and one is not, one is a new classification for Protista and one is old,they created by different people,and include different things.
Answer:
The biology is a branch of science which deals with living organisms
