HARD
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Keeping in view the 'fluid mosaic model' for the structure of cell membrane, which one of the following statements is correct with respect to the movement of lipids and proteins from one lipid monolayer to the other (described as flip-flop movement)?

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Important Questions on Cell : The Unit of Life

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Biology>Cell : Structure and Functions>Cell : The Unit of Life>Eukaryotic Cell
Match the columns and identify the correct option.
 
  Column I   Column II
A Thylakoids (i) Disc-shaped sacs in Golgi apparatus
B Cristae (ii) Condensed structure of DNA
C Cisternae (iii) Flat membranous sacs in stroma
D Chromatin (iv) Infoldings in mitochondria
EASY
Biology>Cell : Structure and Functions>Cell : The Unit of Life>Eukaryotic Cell
Water-soluble pigments found in plant cell vacuoles are:
EASY
Biology>Cell : Structure and Functions>Cell : The Unit of Life>Eukaryotic Cell
Which of the following are not membrane-bound?
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Biology>Cell : Structure and Functions>Cell : The Unit of Life>Eukaryotic Cell
Which of the following statements is incorrect regarding biological membrane?
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Biology>Cell : Structure and Functions>Cell : The Unit of Life>Eukaryotic Cell
Microtubules are the constituents of:
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Biology>Cell : Structure and Functions>Cell : The Unit of Life>Eukaryotic Cell
Balbiani rings are sites of:
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Biology>Cell : Structure and Functions>Cell : The Unit of Life>Eukaryotic Cell
A protoplast is a cell:
HARD
Biology>Cell : Structure and Functions>Cell : The Unit of Life>Eukaryotic Cell
Select the correct matching in the following pairs:
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Biology>Cell : Structure and Functions>Cell : The Unit of Life>Eukaryotic Cell
Proteins P, Q, and R are associated with an intact organellar membrane in a cell. If the intact organelle is treated with a high ionic strength buffer, only protein R remained associated with the membrane fraction. Based on this, one could conclude that:
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Biology>Cell : Structure and Functions>Cell : The Unit of Life>Eukaryotic Cell

Mitochondria and chloroplast are:

(i) Semi - autonomous organelles

(ii) Formed by the division of pre-existing organelles and they contain DNA but lack protein synthesizing machinery

Which one of the following option is correct?

HARD
Biology>Cell : Structure and Functions>Cell : The Unit of Life>Eukaryotic Cell
Nuclear envelope is a derivative of:
EASY
Biology>Cell : Structure and Functions>Cell : The Unit of Life>Eukaryotic Cell
At physiological temperature, sterols in biological membranes:
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Biology>Cell : Structure and Functions>Cell : The Unit of Life>Eukaryotic Cell
The chromosomes in which centromere is situated close to one end are:
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Biology>Cell : Structure and Functions>Cell : The Unit of Life>Eukaryotic Cell
Cellular organelles with membranes are:
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Biology>Cell : Structure and Functions>Cell : The Unit of Life>Eukaryotic Cell
The structures that are formed by stacking of organized flattened membranous sacs in the chloroplasts are:
EASY
Biology>Cell : Structure and Functions>Cell : The Unit of Life>Eukaryotic Cell
A cell organelle containing hydrolytic enzymes is:
EASY
Biology>Cell : Structure and Functions>Cell : The Unit of Life>Eukaryotic Cell
DNA is not present in:
EASY
Biology>Cell : Structure and Functions>Cell : The Unit of Life>Eukaryotic Cell
Which one of the following cell organelles are enclosed by a single membrane?
EASY
Biology>Cell : Structure and Functions>Cell : The Unit of Life>Eukaryotic Cell
The region of chromatin that is stained lightly is
MEDIUM
Biology>Cell : Structure and Functions>Cell : The Unit of Life>Eukaryotic Cell
Select the incorrect statements from the following
I) In plasma membrane, hydrophilic polar heads of lipids arrange towards the outside and the hydrophobic tail towards the inner side
II) In the plasma membrane, peripheral proteins lie on the surface of the membrane while the integrated proteins are not buried in the membrane
III) Neutral solutes may move across the membrane by the process of simple diffusion against the concentration gradient
IV) Polar molecules can pass through the non-polar lipid bilayer and do not require a carrier protein