The polymerase chain reaction (PCR):
a) enables researchers to determine the sequence of a complementary strand of DNA when they have only single-stranded DNA.
b) makes it possible to create huge numbers of copies of tiny pieces of DNA
c) utilizes RNA polymerase to build strands of DNA.
d) can create messenger RNA molecules from small pieces of DNA.
e) all of the answers are correct

Option B

Explanation:

The polymer chain reaction machinery, is basically DNA replication but on a grander scale. It is a laboratory technique that is utilized to make several copies of a segment/ fragment of DNA.

PCR is very precise and can be used to amplify, or copy, a specific DNA target sequence. Using PCR, copies of very small amounts of DNA sequences are greatly amplified in a series or cycles of temperature changes.

the answer is sex-linked recessive.

1. amino acid refers to the fundamental building block of proteins, comprising of an amino group and a carboxyl group.

2. catalyst refers to any substance, which increases the rate of chemical reaction without being used up in the reaction.

3. a complex molecule containing he genetic code is dna or deoxyribonucleic acid.

4. an enzyme refers to a molecule of protein, which is unique in accelerating up a particular chemical reaction in the biological systems.

5. nucleic acid refers to an sequence of sugars, phosphates, and nitrogenous bases, for example, dna and rna.

6. a protein refers to a large, composite organic molecule comprising of a huge number of amino acids associated together with the of peptide bonds.

7. rna refers to a nucleic acid that takes part in the production of proteins.

8. substrate refers to a compound, which takes part in a chemical reaction, and is chemically modified by the reaction.