Why does DNA Replicate? When does DNA replication occur in the cell? Be specific

Question

Why does DNA Replicate? When does DNA replication occur in the cell? Be specific! Where does DNA replication occur in the cell? Be specific! True/False - If the sentence Is false, correct the underline part. Cytosine, guanine thymine and adenine are referred to as phosphate groups DNA is in the shape of a double helix. A nucleotide is made of a sugar, phosphate group and two nitrogenous bases Replication happens before cell division. Adenine always pairs with guanine. The sides or "backbone" of DNA is made up of repeating nitrogenous bases and sugars. Replication results in two new daughter strands of DNA. Two covalent bonds form in between adenine and thymine. Sugars and phosphate groups are connected with ionic bonds. Two new daughter strands of DNA are formed DNA polymerase attaches free nucleotides to the growing daughter strand.

Explanation / Answer

Why does DNA replicate?

All life forms needs to reproduce themselves otherwise they will become extinct.DNA replication is necessary so that when cell divides each daughter cell gets an intact copy of same DNA.DNA replication is also important for translation because proteins are essential for growth of organisms.

When does DNA replication occur in the cell?

DNA replication occurs in the S phase of cell cycle in a cell

Where does DNA replication occur in a cell?

DNA replication takes place in the nucleus in case of eukaryotes and in cytoplasm of prokaryotes.

True or False:

a)Cytosine,Adenine,Guanine and Thymine are referred to as phosphate groups. ---False

Cytosine,Adenine,Guanine and Thymine are referred to as nitrogenous bases.

b) DNA is in the shape of a double helix -----True

c) A nucleotide is made up of sugar,phosphate group and two nitrogenous bases ---False

A nucleotide is made up of sugar,phosphate group and one nitrogenous base.

d) Replication happens before cell division -- True

e) Adenine always pairs with guanine -- False

Adenine always pairs with thymine.

f) The sides or backbone of DNA is made up of repeating nitrogenous bases and sugars -- true.

g) Replication results in two new daughter strands of DNA .-- True.

h) Two covalent bonds form in between adenine and thymine --False

Two hydrogen bonds form in between adenine and thymine

i) Sugar and phosphate groups are connected with ionic bonds. -- False

Sugar and phosphate groups are connected with phosphodiester bonds.

DNA replication sequence:

STEP 1 Helicase begins to break H-bonds, and unzips the parental DNA.

STEP 2 RNA Primase adds a short RNA primer,which allows DNA polymerase to begin working.

STEP 3 DNA polymerase attaches free nucleotides to the growing daughter strand.

STEP 4 Two new daughter strands of DNA are formed

STEP 5 The cell finishes DNA replication and prepares to enter mitosis.

Fill in the blank.:

1. Adenine ,guanine,cytosine and thymine are the four nitrogenous bases.

2. In DNA, cytosine always pairs with guanine.

3. In RNA, uracil replaces thymine.

4.The process of replication produces a new copy of an organism's genetic information.

5. The spiral shape of DNA is called a double   helix.

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