BIOL 1202 Chapter : Microbes
Document Summary
Viroids - even simpler and smaller than viruses ( single stranded rna) Fragments of single- stranded rna with no protein coat. Hijack cells - infects primarily plant cells including citrus trees, potatoes, avocados. Prion dumps - polypeptides that cause animals to lose control. Prions form a glob of sticky protein that interferes with brain functioning (loss of. Protein particle with no genetic material ( i. e. dna or rna) Prions consist of a protein that is folded wrong and makes other proteins fold wrong. 14000 species described, may be 100- 1000x that number. 1st organisms to appear on earth, 3. 5 billion years ago. Cell wall = semi- rigid, permeable, made of peptidoglycan (carbohydrate with amino acids attached). If you have a gram positive cell, you have two structures in which surrounds ( thick ) Two structures and then a thick peptido layer. Gram negative (thin)surrounded by plasma membrane and an outer membrane, thin peptido membrane.
