Multiple choice

Which among the following statements does not characterise the chloroplasts of the plant cells?

  1. All chloroplasts have at least three membrane systems.

  2. Many chloroplast DNAs contain numerous inverted repeats.

  3. Cyanobacteria are considered the ancestors of chloroplasts.

  4. In land plants, chloroplasts are generally lens-shaped.

  5. The inner chloroplast membrane regulates the passage of material.
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B Correct answer
Explanation

Many chloroplast DNAs contain two inverted repeats, which separate a long single copy section (LSC) from a short single copy section (SSC). While a given pair of inverted repeats is rarely completely identical, they are always very similar to each other, apparently resulting from concerted evolution.

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