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Igoryamba
2 years ago
13

The first step of PCR

Biology
1 answer:
Lorico [155]2 years ago
7 0

Answer:

First step:

B. DNA is heated to break the hydrogen bonds that hold the two strands together

Second step:

D. DNA is cooled to allow the primers to bind to the DNA strands Primers

Explanation:

Polymerase chain reaction, or commonly called PCR, is a molecular technique invented by Katy Mullis in the 1980's. It is used to amplify a sequence of DNA template to form several copies.

The process of polymerase chain reaction occurs in three major steps viz;

Step 1: In this step, the DNA template is denatured by heating it to a high temperature. This is done to separate the double stranded molecule into single strands by breaking the hydrogen bonds holding the nucleotides base together.

Step 2: Next, the temperature is reduced or allowed to cook in order for short DNA fragments called PRIMERS to bind to the site on the DNA strands. This step is called ANNEALING.

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Hope that helps and feel free to ask me more questions :)Brainliest??



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What kind of habitat did tiktaalik live in?
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3 years ago
What is a pacu fish's predators/dangers
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A frenzied attack by a group of Piranha will set the water churning. They will attack and eat all sorts of aquatic animals, insects, lizards and amphibians. They will also devour rodents, carrion (dead meat), and sickly or weakened land animals that venture into the water.

The teeth of the Piranha are triangular in shape with an exact fit in their jaw, comparable to a bear-trap. They are designed to puncture and slice the flesh from their prey. They can strip their prey to the bone in a matter of minutes.

These fish are a great source of fascination. Their natural behaviors have become fodder for the scripts of moviemakers looking for a sensational twist to excite and entice an audience. What could be more intriguing than creating a 'fear factor' from the behaviors of these provocative fish found in the "wild". Yet just like the Great White Shark and the Anaconda constrictor, also popular subjects of thriller movies, the Piranha’s behaviors are over-fantasized.

The Piranha does engage in a feeding frenzy that will "make the water boil" if only because a hungry school of fish are trying to reach the same limited food source. All that activity is bound to create water turbulence. A Piranha school generally only consists of about 20 or so fish, but in a feeding frenzy it can reach up to several hundred..

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2 years ago
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