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For transformation, micro-particles coat...

For transformation, micro-particles coated with DNA to be bombarded from gene gun are made up of

A

silver of platinum

B

platinum or zinc

C

silicon or platinum

D

gold or tunsgsten

Text Solution

Verified by Experts

The correct Answer is:
D
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Knowledge Check

  • A spherical cavity is made in a lead sphere of radius R such that its surface touches the outside surface of the lead sphere and passes through its centre. The mass of the lead sphere before hollowing was M. The force of attraction that this sphere would exert ona particle of mass m, which lies at a distance d from the centre of the lead sphere on the straight line joining the centres of the sphere and the centre of the cavity as shown in the figure is

    A
    `(GMm)/(2R^2) hati`
    B
    `-(GMm)/(2R^2) hati`
    C
    `-(GMmd)/(2R^3) hati`
    D
    `(GMm(R/2-d))/(R^3) hati`

  • A particle of mass m and charge q is accelerated by a potential difference V volt and made to enter a magnetic field region at an angle theta with the field. At the same moment another particle of same mass and charge is projected in the direction of the field from the same point. Magnetic field of induction is B. What would be the speed of second particle so that both particles meet again after a regular interval of time which should be minimum.?

    A
    `sqrt((qv)/(m))cos theta`
    B
    `sqrt((2qv)/(m))cos theta`
    C
    `sqrt((qv)/(m))sin theta`
    D
    `sqrt((qv)/(m))cos theta`

  • Suppose earth is a solid sphere of radius R made of a material of density rho . There is a spherical cavity inside earth whose centre is at B . Distance of centre B from the centre of earth A is a . A particle is projected from point D with a velocity u towards the centre of the cavity with a velocity u and the particle strikes the surface of cavity at point C as shown in figure . then

    A
    `u=sqrt(2/3(pirhoGaR))`
    B
    `u=sqrt(1/3(pirhoGaR))`
    C
    `u=sqrt(2pirhoGaR)`
    D
    The particle will never strike the point C

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