Which step of DNA replication occurs BEFORE DNA polymerase extends the new strand of DNA?  - a lagging strand is synthesized  -proofreading enzymes check the DNA -an RNA primer is synthesized -the RNA primers are replaced with DNA nucleotides

Human Anatomy & Physiology (11th Edition)
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Author:Elaine N. Marieb, Katja N. Hoehn
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Chapter1: The Human Body: An Orientation
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Which step of DNA replication occurs BEFORE DNA polymerase extends the new strand of DNA? 

- a lagging strand is synthesized 

-proofreading enzymes check the DNA

-an RNA primer is synthesized

-the RNA primers are replaced with DNA nucleotides

Expert Solution
Step 1

Deoxyribonucleic acid (DNA) stores the cell’s genetic information and is present in the nucleus of the cell. DNA holds information which helps carry out the vital functions of the cell. DNA is transferred from parent to daughter cells during the replication. The DNA contains sequences of nucleotides which code for specific amino acids, which further form proteins. Each DNA strand has a backbone of sugar (deoxyribose) and phosphate groups. Attached to each sugar is one of the four nitrogenous bases: adenine (A), thymine (T), cytosine (C) or guanine (G).

DNA replication is a biological process in which two identical replicas of DNA are produced from one original (parent) DNA. DNA replication occurs in all living organisms and is an essential part of biological inheritance.

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