In the mid-1900s, the Soviet geneticist Lysenko believed that his winter wheat plants, exposed to ever-colder temperatures, would eventually give rise to ever more cold-tolerant winter wheat. Lysenkoʹs attempts in this regard were most in agreement with the ideas of

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#Question id: 1770

#XL - Q Biochemistry

Which of the following immunoglobulin has the highest avidity of the immunoglobulins?

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#Question id: 160

#XL - T Zoology

Of the 20 standard amino acids, only ___________ is not optically active.  The reason is that its side chain ___________.

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#Question id: 2660

#XL - T Zoology

In the lactose operon, the molecule that causes the repressor to fall off the promoter is which of the following?

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#Question id: 11571

#XL - T Zoology

Which of the following is the most likely explanation for hypothyroidism in a patient whose iodine level is normal?

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#Question id: 1067

#XL - T Zoology

The best known chronic infection involves