DNA structure and replication Quiz

Which of the following DNA molecules would be complementary to 5’ AGGCTGATC 3’?

• 5’ TCCGACTTG 3’

• 5’ TCCGAGTAG 3’

• 3’ TCCGGTCGT 5’

• 3’ TCCGACTAG 5’

Which diagram below best represents a segment of a normal DNA molecule?

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What is the biological significance of DNA replication?

• Ensures that environmental conditions are conductive to division.

• Provides the cell a chance to adapt to environmental changes.

• Provides the cell’s genetic code to the daughter cells.

• Ensures that proteins are synthesized for cell division.

The steps of DNA replication are illustrated in the diagram. Which statement best describes the purpose of the

process of DNA replication?

• Making a new DNA molecule that has different bases

• Producing two exact copies of the cell’s original DNA

• Doubling the amount of DNA to increase the number of chromosomes

• Using enzymes to break hydrogen bonds and add nucleotides to strands

The diagram on the right represents part of a DNA molecule.

If X represents Adenine, what molecule is its complementary base?

• Cytosine

• Thymine

• Guanine

• Uracil

A nucleotide does not contain which of the following?

• A 5 carbon sugar

• An amino acid

• A nitrogen base

• A phosphate group

Which of the following is true about DNA?

• A-T and C-G

• A-C and T-G

• A-G and T-C

• A-T and U-G

The bonds that hold the two strands of DNA together come from what?

• The attraction of phosphate groups for each other

• Strong bonds between nitrogenous bases and the sugar-phosphate backbone

• Weak hydrogen bonds between nitrogenous bases

• Carbon-to-carbon bonds in the sugar portion of nucleotides

A cell receives a signal that a specific protein is needed. How is the protein made in response to the signal?

• The protein is made from all the genes on the cell’s DNA

• The protein is made from random genes on the cell’s DNA

• The protein is made from a specific gene sequence on the cell’s DNA

• The protein is made from the restructuring of gene locations on the cell’s DNA

A student creates a model to show the process of DNA replication. 

What are expected end products of the process?

• Two identical RNA molecules

• Two identical DNA molecules

• Two different RNA molecules

• Two different DNA molecules