Structure and discovery of DNA

This chemical contains all the genetic information needed to make an organism.

(a)  

Tags

NGSS.HS-LS1-1

NGSS.HS-LS3-1

A short section of DNA is called a ...

• allele.

• gene.

• base.

• strand.

Tags

NGSS.HS-LS1-1

Select the thing DNA does not have.

• Two strands.

• Bases which join the strands together.

• Twisted strands.

• Protein shell.

Tags

NGSS.HS-LS1-1

Select the base which is not found in DNA.

• Uracil (U)

• Adenine (A)

• Thymine (T)

• Guanine (G)

Tags

NGSS.HS-LS1-1

DNA bases are complementary. This means...

• They will not pair with any other bases.

• They will pair with any kind of base.

• They always pair with only one other type of base.

• They always pair with only two other types of base.

Adenine only combines with...

• cytosine.

• guanine.

• thymine.

• uracil.

Guanine only combines with...

• cytosine.

• adenine.

• thymine.

• uracil.

Tags

NGSS.HS-LS1-1

Uracil is only found in...

• NRA.

• ANA.

• DNA.

• RNA.

The structure of DNA is often called a...

• 'double helix'.

• 'double felix'.

• 'single helix'.

• 'single felix'.

Tags

NGSS.HS-LS1-1

If 19.9% of bases in DNA are adenine. How many are cytosine and guanine?

• 19.9%

• 39.8%

• 30.1%

• 60.2%