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51. What is true about microsomes
A. They are entities attached to endoplasmic reticulum
B. They are not discrete entities in intact cell but are formed during fractionation
C. Microsomes are discrete entities foud throughout the cell
D. They are discrete entities that occur in nucleus and revealed by electron microscope
Explanation:
52. Technique useful for studying synthesis of molecules and tracing metabolic pathways is
A. Chromatography
B. Autoradiography
C. Micro-spectrophotometry
D. Cytochemistry
Explanation:
53. A major breakthrough in the studies of cells came with the development of electron microscope. This is because
A. Electrom microscope is more powerful than the light microscope as it uses a beam of electrons which
B. has wavelength much longer than that of photons
C. Resolution power of electron microscope is much higher than that of light microscope
D. Resolution power of electron microscope is 200 – 350 nm as compared to 0.1 – 0.2 nm for the light
Explanation:
54. Tracer elements are
A. Vitamins
B. Radioisotopes
C. Microelements
D. Macroelements
Explanation:
55. A living cell is to be studied without staining. A microscope useful for it
A. Phase contrast microscope
B. TEM
C. SEM
D. Fluorescent microscope
Explanation:
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