BACE Microscopy and Imaging Techniques

Question 1

What is the total magnification when using a 10x eyepiece with a 40x objective lens on a compound microscope?

Accepted Answer

400x

Answer

Total magnification is calculated by multiplying the eyepiece magnification (10x) by the objective lens magnification (40x), giving 400x.

Question 2

Which type of microscopy uses fluorescent dyes or proteins to visualize specific cellular structures?

Accepted Answer

Fluorescence microscopy

Answer

Fluorescence microscopy uses fluorescent labels that emit light at specific wavelengths when excited, allowing visualization of tagged structures.

Question 3

What is the purpose of immersion oil used with a 100x oil-immersion objective lens?

Accepted Answer

To increase resolution by eliminating refractive index differences between the lens and slide

Answer

Immersion oil has the same refractive index as glass, preventing light refraction at the lens-air interface and improving resolution.

Question 4

Which microscopy technique is most suitable for observing live, unstained, transparent specimens?

Accepted Answer

Phase-contrast microscopy

Answer

Phase-contrast microscopy converts differences in light phase (caused by specimen thickness/density) into visible contrast without requiring staining.

Question 5

What does the term 'resolution' refer to in microscopy?

Accepted Answer

The minimum distance between two points that can be distinguished as separate

Answer

Resolution is the ability of a microscope to distinguish two closely spaced points as separate objects; higher resolution means finer detail is visible.

BACE - Biotechnician Assistant Credentialing Exam Practice Test

BACE - Biotechnician Assistant Credentialing Exam Practice Test

BACE Microscopy and Imaging Techniques