DNA structure

Question 1

What does DNA stand for?

Answer 1

Deoxyribonuleic acid

Question 2

Is DNA a double or a single helix?

Answer 2

Double

Question 3

What is the basic unit of DNA, and what is it made out of?

Answer 3

The basic unit of DNA is nucleotide.

Nucleotide is made out of:
Phosphate, deoxyribose (sugar), nitrogenous base.

Question 4

Name the 4 types of nitrogenous base

Answer 4

Adenine (A)
Thymine (T)
Guanine (G)
Cytosine (C)

Question 5

Describe the DNA molecule

Answer 5

DNA is made of two linked strands that wind around each other to resemble a twisted ladder—a shape known as a double helix.

Question 6

Explain the base pairing rule

Answer 6

The base paring rule dictates how the bases are linked to each other.

In DNA, adenine is always paired with thymine, and guanine is always paired with cytosine.

Question 7

Relate nitrogenous bases & nucleotide

Answer 7

A nucleotide consists of a sugar molecule ( deoxyribose DNA) attached to a phosphate group and a nitrogen-containing base.