DNA Structure and Replication

Multiple Choice

Which scientist(s) discovered the double helix structure of DNA?

• Charles Darwin

• Watson and Crick

• Gregor Mendel

• Rosalind Franklin and Pasteur

Multiple Choice

What is the shape of a DNA molecule?

• Single-stranded helix

• Double helix

• Triple helix

• Straight chain

Multiple Choice

What type of macromolecule is DNA?

• Carbohydrate

• Lipid

• Protein

• Nucleic Acid

Multiple Choice

Which of the following correctly describes a nucleotide, the building block of DNA?

• A phosphate group, a sugar, and a nitrogenous base

• A sugar, a fatty acid, and an amino acid

• A protein, a sugar, and a phosphate group

• A lipid, a sugar, and a nitrogenous base

Multiple Choice

Write the complimentary strand of DNA:

A T C G T T A C T G G C A A T

• A T C G T T A C T G G C A A T

• CGATCCGATGCGAGG

• T A G C A A T G A C C G T T A

• UATAUGCTTUAUTCG

Multiple Choice

What sequence of nucleotides would be on the other side of this DNA strand?

ATGCCGAAAGTC

• TACGGCTTTCAG

• ATGCCGAAAGTC

• UACGGCUUUCAG

• CGATGCATGCAT

Multiple Choice

Why does DNA replication occur before cell division and not after?

• Because each daughter cell needs a complete set of DNA before the cell divides.

• Because DNA replication only happens during mitosis.

• Because cells do not need DNA after division.

• Because DNA replication can only occur when a cell is fully mature.

Multiple Choice

What is the primary function of DNA in a cell?

• To store and transmit genetic information

• To provide energy for cellular processes

• To create lipids for the cell membrane

• To regulate water balance in the cell

Multiple Choice

Which part of the nucleotide determines genetic variation?

• The sugar molecule

• The nitrogenous base

• The phosphate group

• The hydrogen bond

Multiple Choice

What is the purpose of DNA replication?

• To produce energy for cell division

• To create exact copies of DNA before cell division

• To change the genetic code of the organism

• To remove unnecessary genes

Multiple Choice

Why is DNA replication considered semi-conservative?

• Each new DNA molecule contains one original strand and one new strand

• One strand is completely new, while the other is destroyed

• The process occurs in multiple locations on the DNA strand

• The original DNA strand remains unchanged after replication

Match

Match the complementary strands of DNA.

• ATGCCTAG

• CGTACGGA

• TTAAGGCC

• GATTACA

• ACCGTTA

TACGGATC

GCATGCCT

AATTCCGG

CTAATGT

TGGCAAT

• TACGGATC

• GCATGCCT

• AATTCCGG

• CTAATGT

• TGGCAAT

Reorder

Reorder the following

• Enzymes unwind and unzip the DNA double helix.

• Complementary bases are added to both sides

• Two identical DNA molecules are formed, each with one original and one new strand.

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2

3

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