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What is transport system? How this helps to the organism?

Important Questions on Life Processes

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Chromatophores take part in:
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Identify the correct order of organization of genetic material from largest to smallest :
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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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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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When the concentration of solutes differs on the two sides of a membrane permeable only to water, then -
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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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Root pressure is usually acidic because:
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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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Fertilization in humans is practically feasible only if:
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Microtubules are the constituents of:
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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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Glucose is the prime source of energy in our body. However it is stored in the form of glycogen in the muscle and liver of animals and in the form of starch in plants. As a result, every time a cell requires glucose, it must hydrolyze glycogen which is an energy-consuming process. Why does the cell store glycogen instead of glucose in free form?

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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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Which one of the following is not applicable to RNA?
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Nuclear envelope is a derivative of:
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Select the correct matching in the following pairs:
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Gene regulation governing lactose operon of E. coli that involves the lac I gene product is:
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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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Choose one of the following alternative statements given below which correctly explains the process of osmosis.
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Give suitable biological reasons for the given statement:

Root hairs become flaccid and droop when excess fertilizers are added to the moist soil around them.