AP Biology Unit 6: Gene Expression & Regulation

Front

What determines the nucleotide sequence of the newly synthesized strand during DNA replication?

Back

The nucleotide sequence of the template strand.

Front

Which enzyme is used to produce a specific molecule in DNA manipulation?

Back

A restriction enzyme.

Front

In an analysis of the nucleotide composition of DNA, what relationship is found?

Back

A + C = G + T.

Front

What is the function of the tryptophan operon?

Back

It is a repressible operon that is turned off whenever tryptophan is added to the growth medium.

Front

Why does a new DNA strand elongate only in the 5ʹ to 3ʹ direction?

Back

DNA polymerase can only add nucleotides to the free 3ʹ end.

Front

What is the role of DNA polymerase in DNA replication?

Back

It synthesizes new DNA strands by adding nucleotides complementary to the template strand.

Front

What is the significance of Okazaki fragments in DNA replication?

Back

They are short segments of DNA synthesized on the lagging strand during replication.

Front

What is the central dogma of molecular biology?

Back

DNA -> RNA -> Protein.

Front

What is gene expression?

Back

The process by which information from a gene is used to synthesize a functional gene product, usually a protein.

Front

What is the difference between a repressible and an inducible operon?

Back

A repressible operon is usually on and can be turned off, while an inducible operon is usually off and can be turned on.