KVPY Government Jobs Exams

At which stage of Meiosis I does crossing over occur ?
(A) lepoptene (B) zygotene
(C) pachytene (D) diplotene

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KVPY Other Question

According to the original model of DNA, as proposed by Watson & Crick in 1953, DNA is a-
(A) left handed helix
(B) helix that makes a full turn every 70 nm
(C) helix where one turn of DNA contains 20 basepairs
(D) two stranded helix where each strand has opposite polarity An electrode is placed in the axioplasm of a mammalian axon and another electrode is placed just outside the
axon. The potential difference measured will be-
(A) 0 (B) –70 mV
(C) –70 μV (D) +70 μV