BIOL 1301 Lecture 23: human-bio-notes-cont
Document Summary
Nucleus directs cells life processes contains the chromosomes contains one or more nucleoli. Nuclear membrane separates the nucleus from the cytoplasm. Controls the highly selective two way exchange between the nucleus and cytoplasm. Nucleolus ribosomal rna is synthesised and combined with proteins. Cytoplasm semi-fluid material in which the organelles are found. Cell membrane (plasma membrane) regulates movement of substances into and out of the cell. Rough endoplasmic reticulum site of protein synthesis and transport. Golgi body storage, modification and packaging of secretory products. A chain of 8 cubes of length 1 unit each 4. 25:1. A sheet of 12 cubes, arranges in 3 rows of 4 cubes 3. 2:1. A cylinder of radius 1 unit and height 4 units 2. 5:1. The rate of diffusion into or out of cell decreases as the cell increases in size because there is less surface area put unit of volume across which to exchange substances.
