Which of the following are the water-conducting cells of xylem, have thick walls, and are dead at functional maturity?

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#Question id: 19678

#XL - P Chemistry

Which of the following is the IUPAC name of the chemical in which an ethyl group replaces one hydrogen of ammonia?

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#Question id: 19930

#XL - P Chemistry

In the atomic spectrum of hydrogen, the spectral lines pertaining to electronic transition of

n = 4 to n = 2 refers to

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#Question id: 19643

#XL - P Chemistry

The most satisfactory method to separate mixture of sugar is:

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#Question id: 2662

#XL - T Zoology

In the tryptophan operon, tryptophan serves as ________________.

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#Question id: 2671

#XL - T Zoology

The "on/off" switch for an operon is called the