1
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
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
A women with 47 chromosomes due to three copies of chromosome 21 is characterized by
A
triploidy
B
Down’s syndrome
C
superfemaleness
D
Turner’s syndrome
4
AIPMT 2005
MCQ (Single Correct Answer)
+4
-1
Which one of the following makes use of RNA as a template to synthesize DNA -
A
Reverse transcriptase
B
DNA dependant RNA polymerase
C
RNA polymerase
D
DNA polymerase