During early sea urchin development, which embryonic cells have similar organizer activity to that of amphibian Spemann organizer?

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#Question id: 331

#SCPH06 I Botany

A positive and a negative charge are initially 4 cm apart. When they are moved closer together so that they are now only 1 cm apart, the force between them will be

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#Question id: 560

#SCPH06 I Botany

Vmax for an enzyme-catalyzed reaction:

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#Question id: 15653

#SCPH01 Biochemistry

You are studying a new strain of E. coli that can utilize the disaccharide melibiose very efficiently. You find that utilization depends on the enzyme melibiase, which is encoded by the gene Mel1. Mel1 is not expressed unless melibiose is present in the growth medium. You have isolated a mutation that causes constitutive melibiase activity, which you designate MelA–. P1 phage mapping experiments using a Tn5 insertion linked to Mel1 show that MelA– is not linked to Mel1. Moreover you find that when an amber suppressor is introduced into a MelA– mutant, normal melibiase regulation is restored. Classify the MelA– mutation on the basis of genetic properties,  make a proposal for the type of regulatory functions affected by the MelA– mutation?

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#Question id: 3472

#SCPH06 I Botany

Which of the following is incorrect statement?

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#Question id: 262

#SCPH12 I Genetics

Changes in the topology and three-dimensional shape of B-DNA can result from