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Write one difference between channel and carrier proteins?

Important Questions on Cell Membranes and Transport

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Biology>Cell Biology P1>Cell Membranes and Transport>Cell Signalling
Which one of the following is not applicable to RNA?
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Biology>Cell Biology P1>Cell Membranes and Transport>Cell Signalling
Identify the correct order of organization of genetic material from largest to smallest :
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Biology>Cell Biology P1>Cell Membranes and Transport>Cell Signalling
If you suspect major deficiency of antibodies in a person, to which of the following would you like for confirmation evidence?
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Biology>Cell Biology P1>Cell Membranes and Transport>Cell Signalling
Which of the following statements is incorrect regarding biological membrane?
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Biology>Cell Biology P1>Cell Membranes and Transport>Cell Signalling
Microtubules are the constituents of:
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Biology>Cell Biology P1>Cell Membranes and Transport>Cell Signalling
The molecular weight of E coil. DNA is 3.1×109 g/mol. The average molecular weight of the nucleotide pair is 660 g/mol and each nucleotide pair contributes to 0.34 nm to the length of DNA. The length of E coli DNA molecule will be approximately:
EASY
Biology>Cell Biology P1>Cell Membranes and Transport>Cell Signalling
Chromatophores take part in:
HARD
Biology>Cell Biology P1>Cell Membranes and Transport>Cell Signalling
Gene regulation governing lactose operon of E. coli that involves the lac I gene product is:
EASY
Biology>Cell Biology P1>Cell Membranes and Transport>Cell Signalling
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 Biology P1>Cell Membranes and Transport>Cell Signalling

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?

EASY
Biology>Cell Biology P1>Cell Membranes and Transport>Cell Signalling
The schematic below describes the states of the lac operon in the absence of lactose. Which ONE of the following happens when lactose is present in the cell?
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Biology>Cell Biology P1>Cell Membranes and Transport>Cell Signalling
At physiological temperature, sterols in biological membranes:
HARD
Biology>Cell Biology P1>Cell Membranes and Transport>Cell Signalling
Nuclear envelope is a derivative of:
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Biology>Cell Biology P1>Cell Membranes and Transport>Cell Signalling
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
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Biology>Cell Biology P1>Cell Membranes and Transport>Cell Signalling
In sea urchin DNA, which is double-stranded, 17% of the bases were shown to be cytosine. What are the percentages of other three bases expected to be present in this DNA?
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Biology>Cell Biology P1>Cell Membranes and Transport>Cell Signalling
Which one of the following is not an inclusion body found in prokaryotes?
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Biology>Cell Biology P1>Cell Membranes and Transport>Cell Signalling
Select the correct matching in the following pairs:
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Biology>Cell Biology P1>Cell Membranes and Transport>Cell Signalling
Root pressure is usually acidic because:
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Biology>Cell Biology P1>Cell Membranes and Transport>Cell Signalling
Fertilization in humans is practically feasible only if:
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Biology>Cell Biology P1>Cell Membranes and Transport>Cell Signalling
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