en sci quiz

What is the backbone of a DNA molecule made of?

• Ribose and Phosphate

• Deoxyribose and Phosphate

• Glucose and Nitrogen

• Ribose and Protein

Which bases are classified as purines?

• Adenine and Cytosine

• Adenine and Guanine

• Thymine and Guanine

• Cytosine and Thymine

How many hydrogen bonds connect adenine and thymine?

• 1

• 2

• 3

• 4

Who discovered the double-helix structure of DNA?

• Rosalind Franklin

• Friedrich Miescher

• Watson and Crick

• Gregor Mendel

Humans have how many pairs of chromosomes?

• 21

• 22

• 23

• 46

The Central Dogma of molecular biology describes the flow of information from:

• DNA → Protein → RNA

• Protein → RNA → DNA

• DNA → RNA → Protein

• RNA → DNA → Protein

The enzyme that unwinds DNA strands is:

• Ligase

• Helicase

• Topoisomerase

• Primase

Which enzyme removes RNA primers during replication?

• DNA Polymerase III

• DNA Polymerase I

• Ligase

• SSB Proteins

The lagging strand in DNA replication is synthesized in short fragments called:

• Histones

• Exons

• Okazaki fragments

• Nucleosomes

During which phase of the cell cycle does DNA replication occur?

• G1

• S

• G2

• M