UNIT 4 concept 1 flashcard

Front

What are the three components of a DNA nucleotide?

Back

A DNA nucleotide consists of a deoxyribose sugar, a phosphate group, and a nitrogenous base (adenine, guanine, cytosine, or thymine).

Front

What is the role of deoxyribose in DNA?

Back

Deoxyribose is the sugar component of DNA nucleotides, providing the structural framework for the DNA molecule.

Front

What is a nitrogenous base?

Back

A nitrogenous base is a molecule that contains nitrogen and has the chemical properties of a base. In DNA, the nitrogenous bases are adenine, guanine, cytosine, and thymine.

Front

What type of bond connects the nitrogenous bases in DNA?

Back

Weak hydrogen bonds connect the nitrogenous bases in DNA, allowing the two strands to separate during replication.

Front

What distinguishes DNA from RNA?

Back

DNA contains deoxyribose sugar and thymine, while RNA contains ribose sugar and uracil.

Front

What is the function of phosphate groups in DNA?

Back

Phosphate groups link the sugar molecules of adjacent nucleotides, forming the backbone of the DNA strand.

Front

What is the significance of weak hydrogen bonds in DNA structure?

Back

Weak hydrogen bonds allow the DNA strands to separate easily during processes like replication and transcription.

Front

What is the structure of a DNA double helix?

Back

A DNA double helix consists of two strands of nucleotides twisted around each other, with the nitrogenous bases facing inward and connected by hydrogen bonds.

Front

What is the base pairing rule in DNA?

Back

In DNA, adenine pairs with thymine (A-T) and guanine pairs with cytosine (G-C).

Front

What is the role of DNA in living organisms?

Back

DNA stores genetic information that is used for the growth, development, and functioning of living organisms.