These things are surrounded by spikes called peplomers [PEP-luh-mers]. Positive- and negative-sense make up two of the seven categories developed by David Baltimore for these objects. When these things do not have a lipid [LIH-pid] membrane, they are called naked. Some of these replicate by reverse transcription, and these are surrounded by a protein shell called a capsid. Name these objects that 
These things are surrounded by spikes called peplomers [PEP-luh-mers]. Positive- and negative-sense make up two of the seven categories developed by David Baltimore for these objects. When these things do not have a lipid [LIH-pid] membrane, they are called naked. Some of these replicate by reverse transcription, and these are surrounded by a protein shell called a capsid. Name these objects that can only replicate inside living cells and are responsible for many diseases.
These things are surrounded by spikes called peplomers [PEP-luh-mers].
viruses