Cell Organelles

1. Cell Organelles Continuous……..

2. The Cytoskeletonالهيكل الخلوى A network of fibresشبكة من الالياف that provide structural supportتدعيم to the cell Pages 126 - 131

3. Intermediate filaments Microtubules Microfilaments ألياف متوسطة ألياف دقيقة أنيبيبات دقيقة Thick Thin Middle سميكة رفيعة متوسطة Cytoskeleton Responsible for cell motilityحركة ,. (Tubulin protein) transport materials within the cellنقل المواد داخل الخلية. (Actin protein) Support the cell shape شكل الخلية (Fibrous protein) Page 126 - 131

4. Page 127

5. The Cytoskeletonالهيكل الخلوى Functions of the cytoskeleton 1. The cytoskeleton provides mechanical supportدعم and maintains shape of the cellيحافظ على شكل الخلية . 2. The cytoskeleton also plays a major roleيلعب دور اساسي in cell motility حركة الخلية Fig. 7.21a, Page 126

6. 7- Cell membrane • The plasma membrane functions as a selective barrier حاجز إختيارى that allows passage of oxygen, nutrients, and wastes for the whole volume of the cell. Fig. 7.6, Page 113, and Fig. 7.29 Page 133

7. Carbohydrate chains Proteins Cell membrane Composed of lipids (phospholipids) and proteins Lipid layer contains hydrophilic and hydrophobic regions Hydrophilicمُحب للماء Phospholipid Hydrophobicكاره للماء Fig. 7.6 Page 113, and Fig. 7.29 Page 138

8. Comparison between Prokaryotes and Eukaryotes