1. If a DNA strand has 33 % cytosine what percent will be adenine? 64 %
32 %
17 %
36 %

2. Which of the following combinations is true of the nucleotide composition of a sample of DNA?
A = C
A = G AND C = T
A + C = G + T
G + C = T + A

How do you know? Imagine guanine is 30% of the DNA sample. In your notebook, revise the mathematical model you chose in your answer now that you have this information.

4

hydroxyl -oh

alcohols, always polar, can form hydrogen bonds with h2o molecules

carboxyl -cooh  

cargoxylic acids, has acidic properties which is a source of hydrogen ions, found in cells in ionized for with a charge of oh-1

carbonyl > co

ketone if within skeleton, aldehyde if group is at the end of skeleton, k & a may be structural isomers, it determines 2 sugars (ketose & aldose)

amino -nh2

amines, acts as a base, it can pick up h+ ions from surrounding solution, ionized with charge of 1+

methyl ch2

addition to rna/dna affects and gene expression

phosphate -opo3 ²⁻

organic phosphates, contributes to negative charge to, molecule that it is a part of, and potential to react with h20

sulfhydryl -sh

thiols, cross-linking stabilize the protein, and it is structure