U-proteins and R-proteins are needed in

Leptotene

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Zygotene

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Pachytene

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Diplotene

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Solution

The correct option is A Leptotene

Leptotene is the first stage of prophase I of meiosis. During this stage, individual chromosomes begin to condense into long strands within the nucleus. This is when the chromosomes first become visible. The threadlike chromosomes are called chromatonemata. Then the two chromatids are joined together at the centromere. At this stage, the telomeres of the chromosomes are turned toward, and mostly attached to the same region of the nuclear envelope. Meiosis specific proteins namely U-proteins and R-proteins help with the joining of chromatids during the leptotene stage.

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Similar questions

Consider the following statements and choose the correct answer.

I. Carrier proteins are needed by both facilitated diffusion and active transport and are sensitive to inhibitors that react with the protein.

II. Different types of proteins present in the membrane play a major role in both active as well as passive transport.

III. The carrier proteins needed by facilitated and active transport are specific.

IV. There is no need of energy to pump molecule against a concentration gradient in active transport.

V. Transport rate reaches the saturation point when all the active proteins are used.

Nitrogen is needed by plants for the manufacture of proteins.

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