AP BIOLOGY

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LABORATORY REVIEW

MOLECULAR BIOLOGY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Foreign, small, circular, self-replicating DNA molecule that inhabits bacteria and can express itself through the host bacterium. F plasmid contains genes for production of a pilus; a cytoplasmic bridge connecting two cells that allows DNA to move from one cell to another. R plasmid confers resistance to an antibiotic on a host bacterium; can be transferred from one cell to another by conjugation.
A
plasmid
B
pili
C
exons
D
introns
Explanation: 

Detailed explanation-1: -A plasmid is a small circular DNA molecule found in bacteria and some other microscopic organisms. Plasmids are physically separate from chromosomal DNA and replicate independently.

Detailed explanation-2: -The plasmid vectors most widely used for gene cloning are small circular molecules of double-stranded DNA derived from larger plasmids that occur naturally in bacterial cells.

Detailed explanation-3: -Transduction is the transfer of DNA from one bacterium to another by means of a bacteria-infecting virus called a bacteriophage.

Detailed explanation-4: -In conjugation, DNA is transferred from one bacterium to another. After the donor cell pulls itself close to the recipient using a structure called a pilus, DNA is transferred between cells.

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