Answer: DNA is composed of four nitrogenous bases: Adenine, Thymine, Guanine, and Cytosine. Adenine and Guanine are purine bases, while Cytosine and Thymine are pyrimidine bases. Since purine bases mate with pyrimidine bases, Adenine attaches to Thymine, while Guanine attaches to Cytosine.
As DNA is turned into RNA, the nitrogenous base Thymine is replaced with the base Uracil.
Answer: There are four bases in a DNA "ladder"... It is called a ladder because of the "two sides" and the bases... In DNA replication, they obviously replicate and the two sides are replicated as are the bases. (A,T,C,G)
Answer: Molecular geometery is tetrahedral now look below
Now if you look at it you need to find of the geometry has a dipole moment, if it does then that means that it is polar.
Well the clorines have the same electronegativity, so there pull on each other will cancel each other out. Now look at the H Cl
Hydrogen has a less electronegativity than Clorine so its gonna pull the electrons from the H to the clorine resulting in a pull of the toward the Cl meaning it is polar.
Consider carbon tetracloride CCl4 is that polar or non-polar, you might be able to use what I said to find the answer.
Answer: Oxygen reaches the hemoglobin in the blood cells by entering thelungs. The key area of the lungs where the transfer of oxygen andcarbon dioxide is made is called the alveoli. The Alveoli has verythin cell walls which allow oxygen and carbon dioxide to passfreely in and out of the blood stream.
Answer: DNA= deoxyribose nucleic acidDNA is made up of substructures known as nucleotides.Nucleotides are made up of deoxyribose sugar molecules, phosphate groups and nitrogeneous bases.Nitrogen bases are made up of guanine which bonds with cytosine and thymine which bonds with adenine.
Answer: Hydrogen cyanide is a hydrogen bonded to a complex ion, cyanide (CN-). The hydrogen is single bonded to the cyanide ion, which is a carbon triple bonded to a nitrogen atom. See the link below for a good representation of this molecule.