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What do A, B, C and D represent in the following figure?

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Important Questions on Transport in Plants

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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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What are porins? Mention the role they play in diffusion?
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Microtubules are the constituents of:
EASY
If you suspect major deficiency of antibodies in a person, to which of the following would you like for confirmation evidence?
HARD
By which two properties active and facilitated transport differs in different transport processes?
EASY
Root pressure is usually acidic because:
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Fertilization in humans is practically feasible only if:
EASY
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:
EASY
Movement and accumulation of ions across a membrane against their concentration gradient can be explained by:
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What are porins? What role do they play in diffusion?
EASY
Which one of the following will have maximum diffusion pressure?
EASY
Which one of the following is not applicable to RNA?
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Identify the correct order of organization of genetic material from largest to smallest :
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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
EASY
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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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:
MEDIUM
What are porins? What role do they play in diffusion?
MEDIUM
The concentration of OH - ions in a solution with the H+ ions concentration of 1.3×10-4M is
HARD

Find correct statements from the following
A) Protein transporters are responsible for maximum rates of transport under saturated state
B) Translocation of substances in bulk flow requires hydrostatic pressure gradient
C) Root pressure plays the greatest contribution for upward movement of water in tall plants
D) Transport proteins of endodermal cells are control points for active transport of ions in two directions

The correct answer is