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Cell The Unit Of Life

Biology
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Who observed the mitochondria first?

A
Kolliker
B
Robert Brown
C
Robert Hooke
D
Altmann
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Which of the following constitutes biological membrane?

A
Phosphoprotein
B
Protein and phospholipid
C
Phospholipid
D
Cellulose
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Select the correct statement from the following regarding cell membrane.

A
Na and K ions move across cell membrane by passive transport.
B
Proteins make up 60 to 70% of the cell membrane.
C
Lipids are arranged in a bilayer with polar heads towards the inner part.
D
Fluid mosaic model of cell membrane was proposed by Singer and Nicolson.
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The structural component of ribosome is

A
t-RNA
B
m-RNA
C
r-RNA
D
DNA
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F particles or oxysome are present in

A
Endoplasmic reticulum
B
Chloroplast
C
Mitochondria
D
Golgi complex
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Thickness of plasma membrane is

A
10 to 30
B
30 to 50
C
50 to 70
D
70 to 100
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Prokaryotic origin of mitochondria was proposed by

A
Rabinowitch
B
Altmann and Schimper
C
Salton
D
Morrison
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In trees, death of protoplasts is essential for vital function such as

A
Stomatal movements
B
Food transport
C
Water transport
D
Both water and food transport
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Mitochondria are related to

A
Prokaryotes
B
Plasmids
C
Plastids
D
Viruses
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