Group+8

Assignment 1

1.What is DNA? Deoxyribonucleic acid is a molecule that carries genetic information.

2.How is DNA organized inside the cells? Each DNA molecule consists of two parallel strands twinsted around each other to form a double helix.a helix is a coiled structure like a corkscrew or spring.a molecule of DNA is wrapped around proteins to form a single chromatin thread.during cell division,chromatin threads coil tightly into structures called chromosomes inside the cell nucleus.

3.What is genes? It is a sequence or order of DNA nucleotides that determines a particular characteristic of an organism.a gene is actually a small segment of DNA which controls the formation of a single protein such an enzyme.each gene stores a message that determines how an enzyme or protein should be made in the cell.

4.What is the basic unit of DNA and what is it made of? It is called a nucleotide.each nucleotide is made up of a sugar called deoxyribose,a phosphate group and a nitrogen-containing base,all joined together.

5.State the rules rules of base paring. Adeline (A) always bonds with thymine (T). Cytosine (C) always bonds with guanine (G). Adenine and thymine are thus called complementary bases. Cytosine and guanine are also complementary to each other.