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During which phase(s) of the cell cycle, does the amount of DNA in a cell remain at 4C level if the initial amount is denoted as 2C?
Two equally charged, identical metal spheres A and B repel each other with a force $F$. The spheres are kept fixed with a distance $r$ between them. A third identical, but uncharged sphere C is brought in contact with A, then brought in contact with B, and finally placed at the mid-point of the line joining A and B. The magnitude of the net electric force on C is:
During mitosis ER and nucleolus begin to disappear at:
Select the incorrect statement with reference to mitosis.
The reaction of toluene with $Cl_2$ in presence of $FeCl_3$ gives ‘X' and the reaction in presence of light gives 'Y'. 'X' and 'Y' are respectively:
Which of the following options gives the correct sequence of events during mitosis?
The acceleration of a particle is increasing linearly with time $t$ as $bt$. The particle starts from the origin with an initial velocity of $v_0$. The distance travelled by the particle in time $t$ will be:
Young’s double-slit experiment is first performed in air and then in a medium other than air. It is found that the $8^{\text{th}}$ bright fringe in the medium lies where the $5^{\text{th}}$ dark fringe lies in the air. The refractive index of the medium is nearly:
After meiosis I, the resultant daughter cells have:
The appearance of recombination nodules on homologous chromosomes during meiosis characterizes:
In prophase I of Meiosis, chromosomes start pairing together and synapsis takes place. This process occurs during which of the following stage?
The figure given below shows the displacement and time, $(x-t)$ graph of a particle moving along a straight line: The correct statement, about the motion of the particle, is:
Match List-I with List-II: List-I (Sub Phase of Prophase I) A. Diakinesis B. Pachytene C. Zygotene D. Leptotene List-II (Specific characters) I. Synaptonemal complex formation II. Completion of terminalisation of chiasmata III. Chromosomes look like thin threads IV. Appearance of recombination nodules
During which stages of mitosis and meiosis, respectively, does the centromere of each chromosome split?
Which of the following stages of meiosis involves division of centromere?
Which of the following is not a sexually transmitted disease?
A linear aperture whose width is $0.02\text{ cm}$ is placed immediately in front of a lens of focal length $60\text{ cm}$. The aperture is illuminated normally by a parallel beam of wavelength $5 \times 10^{-5}\text{ cm}$. The distance of the first dark band of the diffraction pattern from the centre of the screen is
In meiosis crossing over is initiated at?
Centromere is required for:
Select the wrong statement: