NSBHS 20-21 DNA Structure/Function & Replication

Front

What is the term for a specific region of DNA that codes for a particular protein?

Back

Gene

Front

What are the units that are repeatedly joined together to form a strand of DNA?

Back

Nucleotides

Front

What type of bond holds the nitrogen bases together in DNA?

Back

Hydrogen bonds

Front

What determines the code of a DNA molecule?

Back

The order (sequence) of the nitrogen bases.

Front

What percentage of a DNA sample is cytosine if the percentage of guanine is 28%?

Back

28% (According to Chargaff's rules, cytosine and guanine are present in equal amounts.)

Front

What are the four nitrogen bases found in DNA?

Back

Adenine, Thymine, Cytosine, Guanine.

Front

What is the structure of DNA commonly described as?

Back

A double helix.

Front

What is the function of DNA polymerase in DNA replication?

Back

To synthesize new DNA strands by adding nucleotides complementary to the template strand.

Front

What is the role of helicase in DNA replication?

Back

To unwind and separate the two strands of the DNA double helix.

Front

What is the significance of the 5' and 3' ends of a DNA strand?

Back

They indicate the directionality of the DNA strand, which is important for replication and transcription.