Biology, Pages 334-346Neil Campbell and Jane Reece's BIOLOGY remains unsurpassed as the most successful majors biology textbook in the world. This text has invited more than 4 million students into the study of this dynamic and essential discipline. |
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Page 70
... normal protein to the prion version ( Figure 18.13 ) . In this way , prions may repeatedly trigger chain reactions that increase their numbers . This model , first proposed in the early 1980s , is now widely accepted . Figure 70.
... normal protein to the prion version ( Figure 18.13 ) . In this way , prions may repeatedly trigger chain reactions that increase their numbers . This model , first proposed in the early 1980s , is now widely accepted . Figure 70.
Page 71
... resulting chain reaction may continue until prions accumulate in aggregates to dangerous levels , causing cellular malfunction and eventual degeneration of the brain . Concept Check 18.2 1. Describe two ways a preexisting virus 71.
... resulting chain reaction may continue until prions accumulate in aggregates to dangerous levels , causing cellular malfunction and eventual degeneration of the brain . Concept Check 18.2 1. Describe two ways a preexisting virus 71.
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animal viruses bacterial cell bacterial chromosome bacteriophage bacterium bind to specific capsid cause disease cellular enzymes circular coli cell Cycles of Phages DNA molecule double-stranded emerging viruses enter the host enveloped viruses eukaryotes existing viruses Figure genetic recombination glycoproteins herpesvirus host cell host range host species human disease immune system kill the host lysogenic cycle lytic cycle mechanisms membranous envelope microbes model systems mosaic virus TMV mRNA mutation natural selection favors nucleic acid obligate intracellular parasites particles phage DNA plant to plant plant viruses plasmids plasmodesmata polymerase prions prokaryotic prophage genes protein coat provirus restriction enzymes retrovirus reverse transcriptase RNA viruses Scientists simplest spread stranded RNA symptoms syndrome synthesis temperate phage template tobacco mosaic virus transcribed transposons type of virus vaccines vertical transmission viral diseases viral DNA viral envelope viral genome viral infection viral nucleic acid viral proteins viral reproductive cycle viroids virulent phage viruses and bacteria viruses cause