Chapter 3 Cellular Level of Organization

Chapter 3 Cellular Level of Organization - Chapter 3 The...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 3 The Cellular Level of Organization Pages 61 – 76 1. Parts of a Cell: Fig.3.1 Smallest living unit Cells come from other cells. There are 100 trillion cells in humans . A. Plasma Membrane - Forms the cells flexible outer surface separating the internal and external environment of the cell. 1. Selectively Permeable B. Cytoplasm – All the cellular contents between the plasma membrane and the nucleus. Contains various organelles . C. Nucleus – Houses most of the cell’s DNA/hereditary information Ribosomes created in nucleolus Chromatin: DNA wrapped around protein. Chromosome: Condensed chromatin; Able to be separated. 2. The Plasma Membrane: Fig. 3.2 Fluid mosaic model, proteins are floating and embedded on the layer. A. The Lipid Bilayer i. Phospholipids – Lipids that contain phosphorus. ii. Cholesterol – Steroid with an attached hydroxyl group. o Cholesterol controls fluidity and permeability of membrane, and it also gives the rigidity of the membrane. iii. Glycolipids – Lipids with attached carbohydrate (sugar) groups . i. Only present on outer surface of outer lipids. 1
Background image of page 1

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

View Full DocumentRight Arrow Icon
2 Parts of the Cell
Background image of page 2
3 Plasma Membrane
Background image of page 3

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

View Full DocumentRight Arrow Icon
B. Arrangement of Membrane Proteins i. Integral Proteins – Extend into or through the lipid bilayer among the fatty acid tails and are firmly embedded in it. ii. Transmembrane Proteins - Spans the entire lipid bilayer and protrude into both the cytosol and extracellular fluid. o Can also be integral iii. Peripheral Proteins – Associate with loosely attached with the polar heads of membrane lipids or with integral proteins. iv. Glycoproteins – Proteins with carbohydrate (sugar) groups attached to the ends that protrude into the extracellular fluid . v. Glycocalyx - The extensive sugary coat that covers glycolipids and glycoproteins, and it is like the “signature” that enables one cell to recognize another . o
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 12/04/2011 for the course BIO 301 taught by Professor Rupade during the Spring '09 term at Purdue.

Page1 / 12

Chapter 3 Cellular Level of Organization - Chapter 3 The...

This preview shows document pages 1 - 5. Sign up to view the full document.

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