What kind of lenses are used to focus a high-velocity electron beam instead of the visible light.

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#Question id: 1576

#Zoology

function of Properdin

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#Question id: 1581

#Zoology

An otherwise healthy student in your class is infected with EBV, the virus that causes infectious mononucleosis. The same student had already been infected when she was a child, and she had merely experienced a mild sore throat and swollen lymph nodes in her neck. This time, though infected, she does not get sick. 

Her immune systemʹs recognition of this infection will involve which of the following?

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#Question id: 1582

#Zoology

The EBV antigen fragments will be presented by the virus-infected cells along with which of the following?

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#Question id: 19448

#Zoology

Which of the following incident lights will give better resolution of a specimen?

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#Question id: 19449

#Zoology

Better resolution of the image can be achieved by which of the following wavelengths? 

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#Question id: 19450

#Zoology

Why do we go for higher refractive index when we want to achieve?