MCB 32 Lecture 2 - Molecular Cell Biology 32 Professor...

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Molecular Cell Biology 32 Professor Terry Machen 08/31/10 Lecture 2 ASUC Lecture Notes Online is the only authorized note-taking service at UC Berkeley. Do not share, copy, or illegally distribute (electronically or otherwise) these notes. Our student-run program depends on your individual subscription for its continued existence. These notes are copyrighted by the University of California and are for your personal use only. D O N O T C O P Y Sharing or copying these notes is illegal and could end note taking for this course. Announcements Omit DNA, RNA and mitosis and meiosis material also Omit protein synthesis. You are responsible for the material in lecture mostly. There shouldn’t be an intense amount of reading from the text book. Questions on quizzes during discussion section will be similar from questions in back of chapter in book. Office hours have changed to Monday from 1–2 p.m. and Thursday from 2–3 p.m. Questions after lecture will meet in VLSB court yard instead of in lecture room for those with quick questions. Lecture Protein synthesis is done by dehydration reaction; diagram shows one molecule of an amino acid. One nitrogen with two hydrogens make up an amino group. A carbon with two oxygens is the acidic part hence the reason why it is called an amino ACID. The R groups or side group will be different; there are 20 different amino acids. Formation into a polypeptide or protein is done by dehydration by taking water out of 2 adjacent amino acids. This forms a peptide bond and if it is a larger polypeptide it forms what is called a protein. Specific structures are developed from the protein. There are 4 different types of structures formed by the amino acids. Primary structure is the sequence of the amino acids and is determined by the DNA (which we will omit at this time). Primary structure can fold into a more complicated structure known as alpha helixes and beta plated sheets. These are known as secondary structure and are held by intermolecular interactions. The dotted lines represent these hydrogen bonds which are a type of intermolecular interaction. A more complicated structure is when these secondary structures fold and form tertiary structure. Heme is a molecule that is an example of a tertiary structure and consists of a heme group. Hemoglobin is an example of a quaternary structure which consists of 4 heme groups. Quaternary structure is the interaction of multiple tertiary structures. Primary is determined by sequence of DNA. Where as in higher order structures the structure is determined by intermolecular bonds. You should know and distinguish the different organelles. Organelles are structures inside of a cell that have very specific functions. Cells aren’t empty bags of liquid; they have complicated organelles that cram into a cell. Cells have an approximate diameter of 20 micro
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This note was uploaded on 09/29/2010 for the course MCB 57703 taught by Professor Machen during the Fall '08 term at University of California, Berkeley.

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MCB 32 Lecture 2 - Molecular Cell Biology 32 Professor...

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