Unit 1 Case Study 2023 - Quiz 2

Label the following on the nucleotide

a

b

c

Pentose Sugar

Phosphate

Nitrogenous base

DNA stands for ...

In DNA the back bone is made of molecules called ​ (a)   . Each Nucleotide consists of a ​ (b)   connected to a ​ (c)   . These two parts are joined together with ​ (d)   bonds. Each Nucleotide also has a specific ​ (e)   .

• Nucleotides
• Deoxyribose sugar
• Phosphate group
• Phosphodiester
• Nitrogenous base

Match the following bases with their complementary ones ...

• Cytosine

• Cytosine

• Adenine

• Guanine

• Thymine

• Thymine

• Guanine

• Adenine

Draw a Purine base

Draw a pyramidine base

Describe the complementary base pairing in DNA

The bases in DNA are connected by ​ (a)   . These bases are attached to two ​ (b)   backbones that run ​ (c)   . These twist the two backbones into a ​ (d)   shape. RNA also contains bases but RNA is a ​ (e)   chain.

• Hydrogen Bonds
• Nucleotide
• Antiparallel
• Double Helix
• Single stranded

Reorder the following steps of semi conservative replication

• DNA Helicase breaks the hydrogen bonds between the complementary bases unwinding the DNA strands

• A replication fork is created

• Free DNA nucleotides come in and hydrogen bond with their complementary bases

• 2 molecules of identical DNA are produced - Each contains 1 new strand and 1 original strand.

• DNA polymerase comes in and joins the free nucleotides together with phosphodiester bonds

Describe in detail the steps in semi-conservative replication