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Centromere is required for:
Select the wrong statement:
Given below is a schematic break-up of the phases/stages of cell cycle. Which one of the following is the correct indication of the stage/phase in the cell cycle?
Unpolarised light is incident from the air on a plane surface of a material of refractive index $\mu$. At a particular angle of incidence $i$, it is found that the reflected and refracted rays are perpendicular to each other. Which of the following options is correct for this situation?
Match Column-I with Column-II.
The enzyme recombinase is required at which stage of meiosis:
Which of the following is not a characteristic feature during mitosis in cells?
Spindle fiber unites with which structure of chromosomes:
Match the stages of meiosis in Column I to their characteristic features in Column II and select the correct option using the codes given below:
A beam of cathode rays is subjected to crossed Electric (E) and magnetic fields (B). The fields are adjusted such that the beam is not deflected. The specific charge of the cathode rays is given by:
Diadelphous stamens are found in
Bivalent or Tetrad formation is a characteristic feature observed during :
During gamete formation, the enzyme recombinase participates during:
Recombination between homologous chromosomes is completed by the end of:
Crossing over that results in genetic recombination in higher organisms occurs between:
In Young's double-slit experiment, the separation $d$ between the slits is $2 \text{ mm}$, the wavelength $\lambda$ of the light used is $5896 \text{ \AA}$ and distance $D$ between the screen and slits is $100 \text{ cm}$. It is found that the angular width of the fringes is $0.20^{\circ}$. To increase the fringe angular width to $0.21^{\circ}$ (with same $\lambda$ and $D$) the separation between the slits needs to be changed to:
The process of appearance of recombination nodules occurs at which sub stage of prophase I in meiosis?
Spindle fibres attach on to?
In meiosis, crossing over and exchange of genetic material between homologous chromosomes are catalyzed by the enzyme:
Pure $\text{Si}$ at $500\text{ K}$ has an equal number of electron ($n_e$) and hole ($n_h$) concentration of $1.5 \times 10^{16} \text{ m}^{-3}$. Doping by indium increases the hole concentration $n_h$ to $4.5 \times 10^{22} \text{ m}^{-3}$. The doped semiconductor is of: