Why are hydrogen bonds important in the structure of DNA?

They allow for easy replication

They provide structural support

They are strong and unbreakable

Why are DNA strands described as antiparallel?

Because they run in opposite directions

Because they run in the same direction

What components are found at the 3' and 5' ends of each DNA strand?

Deoxyribose sugar and phosphate

Deoxyribose sugar and ribose sugar

Why can the DNA chain only grow in a specific direction?

Because the 3' and 5' ends are distinct

Because the 3' and 5' ends are identical

Because the 3' and 5' ends are parallel

Because the 3' and 5' ends are random

Why is DNA considered a unique molecule?

Because it can direct its own replication and reproduce itself exactly

Because it can change its structure frequently

Because it can only be found in certain cells

What is the first step in the process of cell division as shown in the diagram?

Chromosomes in the nucleus are copied

Chromatids are pulled apart and moved towards poles

What happens first during the replication of DNA?

Hydrogen bonds between base pairs break

DNA polymerase adds new nucleotides

What is the result of the action of DNA polymerase on the leading strand during DNA replication?

The leading strand is replicated continuously

The leading strand is replicated discontinuously

The leading strand is not replicated

What is the role of DNA polymerase in the replication of the leading strand?

It joins individual nucleotides into the backbone.

It unwinds the DNA double helix.

It adds primers to the DNA strand.

It separates the two DNA strands.

What is the function of the primer in DNA replication?

It provides a starting point for DNA synthesis.

It unwinds the DNA double helix.

It joins individual nucleotides into the backbone.

It separates the two DNA strands.

What must happen to each fragment during the replication of the lagging strand of DNA?

Each fragment must be primed to allow DNA polymerase to bind nucleotides together.

Each fragment must be heated to allow DNA polymerase to bind nucleotides together.

Each fragment must be cooled to allow DNA polymerase to bind nucleotides together.

Each fragment must be cut to allow DNA polymerase to bind nucleotides together.

DNA Structure Quiz

Authored by Dr Armstrong

Science

9th Grade

Used 1+ times

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What are the repeating units called that make up the two strands of DNA?

A. Amino acids

B. Nucleotides

C. Proteins

D. Lipids

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What shape does the DNA structure form?

A. Single helix

B. Triple helix

C. Double helix

D. Quadruple helix

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What are DNA nucleotides made of?

A. Ribose sugar, phosphate, base

B. Deoxyribose sugar, phosphate, base

C. Glucose, phosphate, base

D. Fructose, phosphate, base

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is NOT a base found in DNA nucleotides?

A. Adenine

B. Thymine

C. Cytosine

D. Uracil

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What are DNA nucleotides made of?

Deoxyribose sugar, phosphate, base (ATGC)

Ribose sugar, phosphate, base (AUGC)

Deoxyribose sugar, phosphate, base (AUGC)

Ribose sugar, phosphate, base (ATGC)

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In a nucleotide, where is the base attached on the deoxyribose sugar?

Carbon 1

Carbon 2

Carbon 3

Carbon 5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In a nucleotide, where is the phosphate attached on the deoxyribose sugar?

Carbon 1

Carbon 2

Carbon 3

Carbon 5

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