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Question 4 • TPS EdX Biology

Which series lists the correct order of steps of binary fission from first to last?

Answer

sex pilus connects two cells → plasmid DNA is transferred → complementary DNA strands are created → cells separate

virus infects bacterial cell, new viruses are made → DNA is assembled in new virus → new virus infects another bacterial cell and transfers DNA

DNA is copied → DNA molecules attach to cell membrane → cell membrane elongates and pinches off → two identical cells are produced

live cells bind to degraded cells → DNA is transported across the membrane → DNA is incorporated into recipient's DNA

Explanation

In binary fission, the cell first copies its DNA. The DNA copies attach to the cell membrane as the cell grows and elongates; then the membrane pinches inward, dividing the cell into two identical cells. Choice C gives this sequence. Choice A describes conjugation, while choice D describes transformation.

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