In chemical synapses that involve a so-called second messenger, typically a G-protein linked to the postsynaptic receptor is activated when neurotransmitter binds to that receptor. Which of the following represents an activity performed by the activated second messenger?

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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: 19507

#SCPH05 I Biotechnology

Which of the following electronic configurations of an atom has the lowest ionisation enthalpy?

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#Question id: 41

#SCPH28 | Zoology

Enzymes are biological catalysts that enhance the rate of reaction by:

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#Question id: 351

#SCPH28 | Zoology

 If the cytoplasm of a cell is at pH 7, and the mitochondrial matrix is at pH 8, then the concentration of H+ ions ________.

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#Question id: 15753

#SCPH05 I Biotechnology

Match the following:

Column I                  Column II

I Alkaloids               P. Digoxigenin

II Terpenoids          Q. Menthol

III Quinones           R. Anthocyanins

IV Steroids            S. Anthraquinones

                              T. Morphine