KVPY Government Jobs Exams

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

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KVPY Other Question
The process of cell death involving DNA cleavage in cells is known as-
(A) necrosis (B) apoptosis
(C) cytokinesis (D) endocytosis At which stage of Meiosis I does crossing over occur ?
(A) lepoptene (B) zygotene
(C) pachytene (D) diplotene