1
AIPMT 2006
MCQ (Single Correct Answer)
+4
-1
A major breakthrough in the studies of cells came with the development of electron microscope. This is because
A
Electron beam can pass through thick materials, whereas light microscopy requires thin sections
B
The resolution power of the electron microscope is much higher than that of the light microscope
C
The electron microscope is more powerful than the light microscope as it uses a beam of electrons which has wavelength much longer than that of photons
D
The resolving power of the electron microscope is 200-350 nm as compared to 0.1-0.2 nm for the light microscope
2
AIPMT 2005
MCQ (Single Correct Answer)
+4
-1
Centromere is required for -
A
Crossing over
B
Movement of chromosomes towards poles
C
Transcription
D
Cytoplasmic cleavage
3
AIPMT 2005
MCQ (Single Correct Answer)
+4
-1
Chemiosmotic theory of ATP synthesis in the chloroplasts and mitochondria is based on
A
Proton gradient
B
Membrane potential
C
Accumulation of Na+ ions
D
Accumulation of K+ ions
4
AIPMT 2005
MCQ (Single Correct Answer)
+4
-1
According to widely accepted "fluid mosaic model" cell membranes are semi-fluid, where lipids and integral proteins can diffuse randomly. In recent years, this model has been modified in several respects. In this regard, which of the following statements are incorrect ?
A
Proteins in cell membranes can travel within the lipid bilayer
B
Proteins can also undergo flip-flop movements in the lipid bilayer
C
Proteins can remain confined within certain domains of the membranes
D
Many proteins remain completely embedded within the lipid bilayer

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