Which of the following is true for nucleolus? (1) It takes part in spindle formation. (2) It is a membrane-bound structure. (3) Larger nucleoli are present in dividing cells. (4) It is a site for active ribosomal RNA synthesis.
During Meiosis I, in which stage synapsis takes place? (1) Leptotene (2) Pachytene (3) Zygotene (4) Diplotene
Dissolution of the synaptonemal complex occurs during : (1) Pachytene (2) Zygotene (3) Diplotene (4) Leptotene
In a mitotic cycle, the correct sequence of phases is (1) G1, G2, S, M (2) S, G1, G2, M (3) G1, S, G2, M (4) M, G1, G2, S,
Spindle fibres attach on to (a) centromere of the chromosome (b) kinetosome of the chromosome (c) telomere of the chromosome (d) kinetochore of the chromosome.
In meiosis crossing over is initiated at (a) zygotene (b) diplotene (c) pachytene (d) leptotene.
During cell growth, DNA synthesis takes place on (a) S-phase (b) G1-phase (c) G2-phase (d) M-phase.