BIOL 210 Lecture Notes - Lecture 3: Etioplast, The Plant Cell, Endoplasmic Reticulum
Document Summary
Biol 210 pre-reading assignment: week 2-the plant cell- ch3. The plant cell: an overview- a:protoplast: a. vacuoles and b. plastids. Protoplast- unit of protoplasm inside cell wall: the protoplasm of a living plant or bacterial cell whose cell wall has been removed, consists of cytoplasm and nucleus. Cytoplasmic streaming-cyclosis- if cell alive cytosol currents moving. Nuclear genome- genetic information stored in nucleus. Chromatin- thin treads and grains distinguished from nucleoplasm: made of dna, condensed- chromosomes. Haploid- number of chromosomes in a gamete. Diploid- number of chromosomes in somatic cell. Nucleolus, nucleoli- has high concentrations of rna and proteins, large loops of dna: site of forming ribosomal rna, site of forming ribosomal subunits. Ribosomes are formed in the cytosol and serve at the sites of protein synthesis: Ribosomes- small particles: involved in protein synthesis, occur in polysomes or polyribiosomes- clusters, polysomes often attached to outer surface of nuclear envelope. Plastids- characteristic components of plant cells along with vacuoles and cell walls.
