1.DNA is a molecule composed of two chains in form a compose by, and pentose. And the structure and function of genes.

DNA is a molecule composed of two chains in form of a DOUBLE HELIX compose by ORGANIC NITROGEN CONTAINING BASE, PHOSPHATE GROUPS and PENTOSE.

Explanation:

Nucleic acids are found in all living cells. They are composed of strands made up of repeating units called nucleotides. Each nucleotide consists of

--> a five carbon sugar( PENTOSE)

--> a phosphate group

--> an organic nitrogen containing base: adenine, guanine, cytosine or thymine.

The two types of nucleic acids include:

--> Deoxyribonucleic acid ( DNA) and

--> Ribonucleic acid ( RNA)

Deoxyribonucleic acid ( DNA) is found in chromosomes located in the nucleus of cells.

STRUCTURE OF DNA

The DNA molecule consists of two strands that curve spirally to form a double helix structure. The strands are held together by hydrogen bonds between the base side arms. Each base on one strand will only pair with a specific base on the other strand: hence guanine will only pair with cytosine and adenine with thymine.

FUNCTIONS OF DNA

It stores the organism's hereditary traits and directs the day to day metabolic activities of each cell in the organism.

answer: c.

explanation:

water is a polar molecule. a chemical bond is a force of attraction between atoms or ions. bonds form when atoms share or transfer valence electrons. atoms form chemical bonds to achieve a full outer energy level, which is the most stable arrangement of electrons. so, false

explanation:

in h2o molecule, two water molecules are bonded by a hydrogen bond but the bond between two h - o bonds within a water molecule are covalent. the greater the electronegativity difference, the more ionic the bond is. bonds that are partly ionic are called polar covalent bonds. nonpolar covalent bonds, with equal sharing of the bond electrons, arise when the electronegativities of the two atoms are equal.