A vector is something that

A vector is something that act as carrier. In biology, vector are those organisms which carries disease causing microorganisms such as bacteria and viruses etc. The vector may be insects like mosquitoes, ants and cockroach etc. Mosquitoes carries disease causing agent such as plasmodium which is responsible for the causing of malarial disease.

Cockroach carries many harmful bacteria and causes many diseases.

the sugar-phosphate backbone forms the structural framework of nucleic acids, including dna and rna. this backbone is composed of alternating sugar and phosphate groups, and defines directionality of the molecule.

label a cell membrane

label b cytoplasm

label c ribosomes

label d dna

the membrane forms the outside of the cell

cytoplasm is the liquid within

ribosomes are the components within that distribute rna

the dna is the genetic make-up