DNA Structure and Replication

This image is a single unit of a nucleic acid. What is it called

• carbohydrate

• phospholipid

• nucleotide

• sugar

What is structure labelled "B" in a nucleotide molecule diagram?

• sugar

• phosphate

• nitrogen base

• lipid

Tags

NGSS.HS-LS1-1

What is the structure labelled as "C" in the image of a nucleotide

• sugar

• phosphate

• nitrogen base

• carbohydrate

If the image below represents a DNA nucleotide; what is the name of the molecule labelled "A"?

• phosphate

• ribose

• deoxyribose

• thymine

The image presented here represents a DNA double helix. What kind of a bond holds the nitrogen bases together?

• hydrogen bond

• covalent bond

• guanine bond

• adenine bond

Tags

NGSS.HS-LS1-1

The image presented here represents a DNA double helix. The side rails of the double helix are made up of what two molecules?

• hydrogen and oxygen molecules

• sugar and nitrogen base molecules

• phosphate and nitrogen base molecules

• sugar and phosphate molecules

The image shown here is a DNA strand that is undergoing DNA replication. In the first step, the DNA helix has to unwind. The enzyme that make the DNA unwind (shown in the blue triangle) is called .

• polymerase

• isomerase

• enzymase

• helicase

The image presented here shows a DNA strand undergoing replication. Enzyme "A" unwinds the DNA strand. Enzyme "B" adds new nucleotides to each side of the original strand. What is the name of enzyme "B".

• helicase

• DNA polymerase

• RNA polymerase

• thymase

There are four kinds of DNA nucleotides. What are the names of the four nitrogen bases found in DNA nucleotides?

• Cytosine

• Guanine

• Uracil

• Adenine

• Thymine

The image here shows the results of DNA replication. Describe how the two strands of DNA are made from the original stand and how the two DNA strands present at the end of the process compare to the strand of DNA that starts the process.

Be sure to use the following terms:

-original strand

-new strand(s)

-new nucleotides

-helicase

-DNA polymerase