MIC 205 exam 3 Daydif questions with correct answers

Viruses are CORRECT ANSWER obligate intracellular parachutes what do viruses not have CORRECT ANSWER organelles, cytoplasmic membrane, cytosol, can't carry out metabolic reaction, don't grow n size or respond to environment, cannot reproduce independantly virions CORRECT ANSWER when virus is outside of host -possess a protein coat called capsid -capsid surround and protects nucleic acid(viral genome) viral envelope CORRECT ANSWER -present on some animal viruses -phospholipid bilayer and proteins -proteins: glycoprotein spikes encoded by viral genome which often play role in host cell recognition -acquired from host cell during viral replication why do most viruses only infect specific cells? CORRECT ANSWER Due to the affinity of glycoproteins for complementary portions on host cell surface How are viruses categorized? CORRECT ANSWER genetic material - DNA or RNA but never both -single or double stranded -multiple linear fragments or circular -much smaller than cellular genomes