e) change properties of their hosts d) both b and c are correct 23- All phages m
ID: 273132 • Letter: E
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e) change properties of their hosts d) both b and c are correct 23- All phages must have the ability to a) have their nucleic acid enter the host cell b) have their nucleic acid replicate in the host cell c) synthesize RNA molecules d) both a and b are correct 24- The tail fibers on phages are associated with a) penetration b) attachment c) protein translation d) transcription 25- True or False T4 phage is single stranded RNA lytic phage. 26- True or False T4 is considered a double stranded DNA virulent phage meaning it is lytic. 27- True or False Transduction is the transfer of DNA from a recipient bacterial cell to a donor bacteria 28- True or False The enzyme lysozyme helps a phage break through the bacterial cell wall. 29- The induction of a temperate phage can be achieved by exposing the bacterial cells to ultra violet light. This is probably the result of a) destroying the repressor molecules and allowing RNA polymerase to bind to the promoter region and transcribing a messenger RNA. b) destroy ing the cell wall of the host c) destroying the virus d) all of the above 30-Viroids a) contain only single stranded RNA and cause disease in plants b) use reverse transcriptase in their replication c) are similar in structure to phages d) can cause human diseases 31-Animal viruses can be classified according to a) lipid composition b) Ribosome count c) Genome type, shape and presence of an envelope ps:/bbhosted.c ractice oose %202 dot e ny edu bbe swe bda pid-34672890-dt cont. /courses MECOI BIO 261060 1182Explanation / Answer
Answer. 23 option C is correct as phages has the ability to enter into host cell and also replicate in it.
Answer. 24. B is correct option. Tail fibers helps in attachment to the surface of host.
Answer 25. False because all T even or odd phages have DsDNA as venom or lytic phage.
Answer. 26. True T4 have DsDNA as virulent which causes lysis of host.
Answer 27. False transfer of DNA from one bacteria to other is known as conjugation. While tranfering of DNA from phage to bacteria known as transduction.
Answer 28. True lysosome enzyme helps a phage in breaking bacteria cell wall.
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