DNA Replication

​Cell Cycle- And DNA replication

Multiple Choice

This diagram shows the cell cycle.

Which of the following activities occur in the S phase?

• Replication of the DNA
• Growth of the cell
• Formation of the mitotic spindle
• Breakdown of the nuclear membrane

Multiple Choice

Why does DNA replicate?

• To create a duplicate copy in case the original gets damaged

• New cells will have a copy of the DNA

• To create a new copy to replace the damaged original

Multiple Choice

During the ___ phase, DNA is replicated.

• G1
• S
• G2
• M

Multiple Choice

G1, S, and G2 phases are combined into one long phase called _____________.

• interphase
• mitosis
• cytokinesis
• cell cycle

Multiple Choice

Where in a Eukaryotic cell does DNA Replication take place?

• Cytoplasm

• Ribosomes

• Nucleus

• Cell Membrane

Multiple Choice

What is the end result of DNA replication?

• Two identical DNA molecules each composed of one new and one original strand

• Two non-identical DNA molecules each composed of one new and one original strand

• Two identical DNA molecules. One is made up of the two old strands and one is made up of the two new strands.

• Two non-identical DNA molecules. One is made up of the two old strands and one is made up of the two new strands.

Multiple Choice

order of replication

• 3, 4, 2, 1
• 3, 1, 4, 2
• 2, 1, 4, 3
• 3, 4, 1, 2

Multiple Choice

What is happening to the DNA molecule in the figure? (Explain the first step in DNA replication)

• The DNA molecule is being transcribed into RNA.

• The DNA molecule is being translated into proteins.

• The DNA molecule is being unzipped and separated into two strands.

• The DNA molecule is being repaired.

Match

Match the following DNA base pairs.

• Adenine pairs with

• Thymine pairs with

• Cytosine pairs with

• Guanine pairs with

Thymine

Adenine

Guanine

Cytosine

• Thymine

• Adenine

• Guanine

• Cytosine

Labelling

Complete the DNA molecule based on the rules for complementary base pairing

Drag labels to their correct position on the image

A

G

C

T

Multiple Choice

Which shows the correct complementary DNA strand of ATG?

• ATG

• TAC

• TAG

• CGC

Multiple Choice

What role does DNA Polymerase play in the process of DNA replication as shown in the image?

• It adds free nucleotides to both strands

• It unwinds the DNA helix

• It initiates transcription

Multiple Choice

What happens to the DNA molecule during the second step of DNA replication?

• The DNA strands are separated by helicase.

• New nucleotides are added to the existing DNA strands.

• The DNA strands are joined by ligase.

• The DNA is packaged into chromosomes.

Multiple Choice

What is the function of proofreading during DNA replication?

• To synthesize new DNA strands

• To unwind the DNA double helix

• To correct errors in the newly synthesized DNA

Multiple Choice

What happens during the third step of DNA replication?

• The DNA strands are separated by helicase.

• Primase synthesizes RNA primers.

• Two identical DNA strands result.

• Ligase joins Okazaki fragments.

Multiple Choice

What does the term semi-conservative mean?

• DNA consists of half an old strand and half a new strand and the code stays conserved.

• DNA consists of two old strands and the code stays conserved.

• DNA consists of two new strands and the code stays conserved.

• DNA consists of half an old strand and half a new strand and the code changes each time.

Multiple Choice

The picture below shows the steps of DNA replication beginning with step one and ending with step three.

​Because you are reusing the old, or parent, DNA strand DNA replication is said to be

• Semi- Conservative

• Semi-discontinuous

• Continuous

• Fully-Conserveative

Poll

How confident do you feel about this topic now?

• Very confident
• Somewhat confident
• Not confident