DNA Structure

Multiple Choice

In what organelle do we find the instructions for our traits?

• Cytoplasm

• Ribosomes

• Nucleus

• Endoplasmic Reticulum

Multiple Choice

What does DNA stand for?

• Deoxyriboprotein Acid

• Deoxyribonucleic acid

• Deoxyribonitric Acid

• Double-helix Nucleic Acid

Draw

Circle ONE nucleotide within this DNA model.

Labelling

Label the diagram of a nucleotide.

Drag labels to their correct position on the image

Deoxyribose sugar

Nitrogenous base

Phosphate group

Fill in the Blank

According to Chargaff's rules, the amount of adenine in a DNA molecule is always equal to the amount of ___.

Multiple Choice

Which bases pair together?

• A--> T, C--> G

• A --> G, C --> T

• A--> C, G --> T

Fill in the Blank

Show the complementary strand for the following:

AGCTCATAG

Multiple Choice

What parts of the nucleotide make up the 'rungs' of the DNA ladder?

• The nitrogen bases

• The phosphate groups

• The deoxyribose sugars

• The hydrogen bonds

Multiple Choice

What parts of the nucleotides make up the sides (backbone) of the DNA 'ladder'?

• Phosphate groups and deoxyribose sugars

• Nitrogen bases and phosphate groups

• Deoxyribose sugars and nitrogen bases

• Hydrogen bonds and nitrogen bases

Multiple Select

Which of the following statements about hydrogen bonding in DNA is/are correct?

• Hydrogen bonds hold complementary nitrogenous bases together.

• There are 3 hydrogen bonds between guanine and cytosine.

• There are 2 hydrogen bonds between adenine and thymine.

• Hydrogen bonds connect the sugar and phosphate groups.

Fill in the Blank

The process by which DNA makes a copy of itself is called ___.

Reorder

Reorder the following to describe the steps of DNA replication.

• The DNA double helix untwists and unzips.

• New nucleotides pair with the bases along each of the DNA strands.

• Two new identical DNA molecules are created.

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2

3

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• 3