Which vector can clone only a small fragment of DNA? 
1. Bacterial artificial chromosomes
2. Yeast artificial chromosomes
3. Plasmid
4. Cosmid

Which of the following is not a feature of the plasmids? 
1. Independent replication
2. Circular structure
3. Transferable
4. Single-stranded 

Which one of the following is used as a vector for cloning genes into higher organisms? 
1. Retrovirus
2. Baculovirus
3. Salmonella typhimurium
4. Rhizopusnigricans

Which of the following are used in gene cloning?
1. Lomasomes
2. Mesosomes
3. Plasmids
4. Nucleotides