DNA & Replication - MHS BIOLOGY 2025

1. Rosalind Franklin took diffraction (a)   photos of DNA crystals.

• X-ray
• Infrared
• Ultraviolet
• Gamma-ray

Tags

NGSS.HS-PS4-3

The sides of a DNA molecule are made up of (a)   .

• Sugars and phosphates
• Nucleotides
• Amino acids
• Proteins

The 3 parts of a nucleotide are (a)   , (b)   , and (c)   .

• Sugar, Phosphate, Base
• Protein, Lipid, Carbohydrate
• Acid, Base, Salt
• Enzyme, Substrate, Product

Match the following nitrogen bases with their ring structures.

• Double ring nitrogen bases are called ____________, while single ring nitrogen bases are called _________________

• cytosines; adenines

• Classify the following as double ring and single ring nitrogen bases: ____________, _________________

• purines; pyrimidines

• Identify the double ring nitrogen bases and the single ring nitrogen bases: ____________; _________________

• adenines; thymines

• Nitrogen bases with a double ring structure are known as ____________, whereas those with a single ring are called _________________

• guanines; cytosines

16. Cells must copy their DNA before the cell _________________. New cells will need ________________ DNA strands.

• divides; identical

• divides; different

• grows; identical

• dies; identical

Tags

NGSS.HS-LS1-4

During what part of the cell cycle is DNA copied?

• G1 phase

• S phase

• G2 phase

• M phase

In eukaryotes, the copies of DNA are made in the:

• Nucleus

• Cytoplasm

• Ribosome

• Mitochondria

23. ________________, an enzyme, uncoils DNA so it can be replicated or copied by breaking the ________________ Hydrogen bonds.

• helicase

• polymerase

• ligase

• primase

24. RNA ____________ must be present to start the addition of new nucleotides.

• polymerase

• ligase

• helicase

• primase

25. What enzyme makes the RNA primer?

• DNA polymerase

• RNA polymerase

• Primase

• Helicase