7th Grade Exam-Unit 4 Review

Front

What nitrogen base does guanine always pair with?

Back

Cytosine

Front

Who used X-rays to obtain a clear image of the DNA double helix?

Back

Franklin

Front

What nitrogen base does adenine always pair with?

Back

Thymine

Front

How can a genetic variant (mutation) affect an organism?

Back

It can cause changes that are harmful, beneficial, or neutral.

Front

What is an example of a beneficial genetic variant?

Back

A trait that helps an organism survive in its environment.

Front

What are the four main nitrogen bases in DNA?

Back

Adenine, Thymine, Cytosine, Guanine.

Front

What is the structure of DNA?

Back

A double helix.

Front

What is a mutation?

Back

A change in the DNA sequence.

Front

What is the role of DNA in living organisms?

Back

It carries genetic information.

Front

What is the significance of photo 51?

Back

It provided evidence for the double helix structure of DNA.