Practice Questions

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#Question id: 3868

The sigma factor of E. coli RNA polymerase:

#XL - Q Biochemistry

associates with the promoter before binding core enzyme.
combines with the core enzyme to confer specific binding to a promoter.
is inseparable from the core enzyme.
is required for termination of an RNA chain.

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#Question id: 20032

#XL - P Chemistry

If threshold wavelength for ejection of electron from metal is 300nm, then work function for photoelectric emission is

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#Question id: 11643

#XL - T Zoology

Rapid changes to skin color in many vertebrates is under the control of ________.

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#Question id: 2651

#XL - T Zoology

In the presence of lactose, how long does it take for the lac operon to be expressed?

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#Question id: 8915

#XL - R Botany

The number of legs an insect has, the number of vertebrae in a vertebral column, or the number of joints in a digit (such as a finger) are all strongly influenced by

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#Question id: 17281

#XL - S Microbiology

Identify each of the following structures as haploid or diploid: