BIOL 1202 : Exam 2
Document Summary
Unicellular life has been present for 3 quarters of the time life has been present on earth: plants have nuclear, chloroplast mitochondrial genomes (circular, higher plants-multi-cellular eukaryotes that do photosynthesis, lower plants-like algae. Chloroplasts, dna, plasmids, bacteria, and mitochondrial dna have circular chromosomes. Can be either single- stranded or double stranded dna or rna. Shingles is a dsdna virus: capsid= protein coat which surrounds and protects genome, envelope= membrane (phospholipid bilayer) which surrounds the capsid, all viruses hijack living cells, highly specific for organism it infects. Innate defenses- those there and ready to work like skin and fever. Three lines of defense against microbial attack: external barriers: skin, mucous membranes, skin: physical barrier to microbial entry, inhospitable environment for growth; dry, dead cells at surface. Inflammation (red, swollen, warm: other chemicals macrophages (phagocytic white blood cells) Blood clotting walls off" wounded area, pus is just. Wbc dying: 5 steps: tissue damage carries bacteria into wound.
