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Why cell membranes of cells are selectively permeable?

Important Questions on Cell: Structure and Functions

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Which one of the following is not applicable to RNA?
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Root pressure is usually acidic because:
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Chromatophores take part in:
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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:
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Fertilization in humans is practically feasible only if:
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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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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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Gene regulation governing lactose operon of E. coli that involves the lac I gene product is:
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Microtubules are the constituents of:
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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?

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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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In simple organisms, exchange of gases and excretion occurs through –
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Nuclear envelope is a derivative of:
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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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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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Which one of the following is not an inclusion body found in prokaryotes?
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Select the correct matching in the following pairs:
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Identify the correct order of organization of genetic material from largest to smallest :
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The movement of molecules during diffusion can be described through all of the following except - 
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The plasma membrane (pm) forms the boundary of lung cells. Which of the following statements is true for the pm?
A. Plasma membrane is a semipermeable membrane
B. Water moves across the pm by osmosis.
C. O2 and CO2 can cross the pm by diffusion.
D. Na+ and K+ ions can pass the pm by diffusion.