Recall that cyanobacteria may have developed as a result of transfer of genetic material: a bacterium carrying the genetic information for one photosystem received (from another bacterium) the genetic information for a second, distinct photosystem. What might be possible mechanisms of action for genetic transfer?
A)Bacteria could take up genetic information (released from dead bacteria)from their surroundings.
B)Bacteria may exchange genetic information through the development of cytoplasmic connections.
C)Bacteria may become infected by a virus that carries genetic information taken from previously infected bacteria.
D)All of these choices are correct.

Question

Quizplus · Accepted Answer

All three mechanisms (A, B, and C) are possible ways for bacteria to transfer genetic information. Bacteria can take up genetic information from their surroundings through processes like transformation, where DNA is taken up from the environment; transduction, where genetic material is transferred by a virus that infects bacteria; or conjugation, where genetic material is directly transferred between bacterial cells through the use of specialized structures like pili. Bacteria may also develop cytoplasmic connections through which they can exchange genetic material. Finally, bacteria may become infected by a virus that carries genetic information taken from previously infected bacteria, potentially leading to the transfer of genetic material between unrelated bacterial species.

Recall That Cyanobacteria May Have Developed as a Result of Transfer