H. Bio Flashcard 13.1-13.3

Front

What are the tips of chromosomes called?

Back

Telomeres.

Front

What links nucleotides together to form the DNA chain?

Back

Deoxyribose molecules and phosphate groups.

Front

Which nitrogenous bases form hydrogen bonds in DNA base pairing?

Back

Adenine and thymine.

Front

What is the name of the enzyme that joins individual nucleotides to produce a new strand of DNA?

Back

DNA polymerase.

Front

What is significant about the radioactive isotopes used by Hershey and Chase?

Back

Phosphorus is abundant in DNA, while sulfur is abundant in protein.

Front

What is the structure of DNA?

Back

A double helix composed of two strands of nucleotides.

Front

What are nucleotides made of?

Back

A phosphate group, a deoxyribose sugar, and a nitrogenous base.

Front

What is the role of DNA polymerase in DNA replication?

Back

It synthesizes new DNA strands by adding nucleotides.

Front

What is the function of telomeres?

Back

To protect the ends of chromosomes from deterioration.

Front

What are the four nitrogenous bases in DNA?

Back

Adenine, thymine, cytosine, and guanine.