24.
									
										The genome of M13 bacteriophage is covalently closed circular single stranded DNA. The phagemid vector based on M13 phage genome 
									
								
															
														
																									
										A:
											Covalently closed circular single stranded DNA
									
																										
										B:
											 Covalently closed circular double stranded DNA
									
																										
										C:
											  Covalently closed circular single stranded RNA 
									
																										
										D:
											Linear double stranded DNA 
									
																								 
							
																
									The answer is:
										B