Lecture 2

Lecture 2 - Lecture 2: Chemical Foundations II (Ch. 2- p....

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Lecture 2: Chemical Foundations II (Ch. 2- p. 41-49) DNA and RNA, two types of nucleic acids, are the primary information carrying molecules of the cell they are built from monomers called nucleotides (structure: phosphate group linked to a phosphoester bond to a pentose that is linked to a nitrogen and carbon containing ring called a base ) pentose in DNA is deoxyribose, in RNA it is ribose the bases adenine, cytosine, and guanine are in RNA and DNA the base uracil is only in RNA, and thymine only in DNA adenine and guanine are purines (have a pair of fused rings) cytosine, thymine, and uracil are pyrimidines (a single ring) the 1’ carbon of sugar attaches to position NINE of a purine, or ONE of a pyrimidine nucleotides have an acidic nature due to the phosphate group (releases H+ in normal intracellular conditions) nucleosides- combinations of a base and a sugar without a phosphate. cells and extracellular fluids contain small concentrations of nucleosides nucleotides are nucleosides that have one, two or three phosphate groups esterfied at the 5’ hydroxyl there are nucleoside monophosphates, nucleoside diphosphates (which have a pyrophosphate) and nucleoside triphosphates (ex. ATP, GTP…) nucleoside triphosphates are used in the synthesis on nucleic acids
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 12/02/2010 for the course BIOL 200 taught by Professor Bureau during the Fall '06 term at McGill.

Page1 / 4

Lecture 2 - Lecture 2: Chemical Foundations II (Ch. 2- p....

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online