Explain the structure of the dna molecule. in your answer include the parts that make up the molecule, how these parts
are organized, the shape of the molecule and the relationship between dna molecules and chromosomes.

Answer and Explanation:

The nucleic acid that forms chromosomes is called deoxyribonucleic acid( DNA). DNA is ade up of structural units called nucleotides. Each nucleotide consists of three components linked together by covalent bonds.These are a five-carbon sugar called deoxyribose, a phosphate group and a nitrogenous organic base. The organic bases are four kinds: adenine, guanine, cytosine and thymine.

The nucleotides of DNA are covalently linked to one another forming long polynucleotide chains. The various bases stick out from the backbone at regular intervals forming variable part of the DNA molecule. The linking of bases across the two chains also called base pairing is specific in that adenine will only pairs with thymine and guanine will only pair with cytosine.

d) center of the mid-ocean ridge

give brainleysest

sinserly,

steckh986

cells use diffusion to get substances in and out of themselves. that diffusion will occur across the cell membrane or the outer covering of the cell. because we are talking about the surface of the cell, surface area and volume are  important factors here. as a cell increases in size, its surface area and volume increase as well.  we call that the surface area to volume ratio (sa: vol).  but the catch is that  volume increases at a greater rate than surface  area. in other words, as a cell gets bigger, the sa: vol gets smaller. so a really small cell like bacteria is mostly cell membrane (surface) with very little contents (volume). a really big cell like an egg, is mostly insides with a super thin membrane. so what ends up happening is that the cell cannot efficiently diffuse all of the stuff it needs in/out to survive. therefore cell size is limited to about 100mm. so how do we make organisms bigger than 100mm? cells divide! by dividing and becoming multicellular, organisms are able to grow!   check out the diagrams i attached to see the effect of sa: vol. i hope this ! good luck!