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3 years ago

Which of the following statements about Polymerase Chain Reactions is wrong?

Biology

1 answer:

KonstantinChe [14]3 years ago

5 0

Answer:

The correct answers will be option-B

Explanation:

The polymerase chain reaction is the technique which involves the chain of reaction. The reactions are performed which polymerises or make exact copies of the DNA in higher number from a small sample in vitro-conditions.

The PCR technique is based on the DNA replication mechanism which involves the DNA primers and Taq polymerase, a type of DNA polymerase enzyme.

The PCR proceeds in three steps that are denaturation, annealing, and extension in which the DNA is denatured to break the hydrogen bonds, the addition of the primers at both ends called reverse and forward primers which function simultaneously, synthesis of DNA and extension in which the sample is cooled.

Since the primers are added to both the strands and not on the same strands therefore, the selected option is the correct answer.

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Alpha helix is a coiled structure stabilized by:

viktelen [127]

Answer:

B.hydrogen bonding within polypeptide strands

Explanation:

Alpha helix is one of the secondary structures formed by polypeptide chains. It is formed when the backbone of a polypeptide is wound around a longitudinal axis. The side chains of the amino acids are oriented outwards. Alpha helix structure is stabilized by the formation of a maximum number of hydrogen bonds between the amino acids of the chain. The hydrogen atom linked to the electronegative nitrogen atom of a peptide bond form hydrogen bond with the electronegative carbonyl oxygen atom of the fourth amino acid.

In this way, every peptide bond except the ones present close to each end of the helix take part in hydrogen bonding and stabilize the structure.

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2 years ago

All of these ___ help to block, trap or flush pathogens out of the body.

Licemer1 [7]

Answer:

natural barriers

Explanation:

skin, mucous membrane, tears, earwax, muscus, stomach acid

6 0

2 years ago

Describe how environmental change can impact ecosystem stability

earnstyle [38]

Answer:

Environmental change results in the environmental ecosystem to be able to adapt to a new environment to survive the impact of environmental change can cause a decrease in the amount of organisms living in that ecosystem and without one of the organism living in the ecosystem the other organism supports on the other organism for food/energy will be scarce resulting in a decrease of species eventually dying out.

3 0

3 years ago

choose the animal belonging to pisces group: silver fish, sea horse,dolphin, lobster. answer asap! thx

mihalych1998 [28]

Answer:

The correct answer is

Explanation:

Lobster is the answer. People eat lobster in pieces which we call as lobster piece.

Hope this helps....

Have a nice day!!!!

8 0

3 years ago

How does the location of the carbon in the sugar molecule differ between the strands

scoundrel [369]

During a dehydration reaction, two monomer molecules are covalently bonded to each other, with the loss of a water molecule. In this reaction, each monomer contributes part of the water molecule that is released during the reaction. This reaction is repeated as monomers are added to the chain one by one, making a polymer.

6 0

2 years ago