The rate-limiting step during the synthesis of all steroid hormones is done by which enzyme? 

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#Question id: 4143

#Unit 3. Fundamental Processes

It is possible to convert the Cys that is a part of Cys-tRNACys to Ala by a catalytic reduction.  If the resulting Ala-tRNACys were added to a mixture of (1) ribosomes, (2) all the other tRNAs and amino acids, (3) all of the cofactors and enzymes needed to make protein in vitro, and (4) mRNA for hemoglobin, where in the newly synthesized hemoglobin would the Ala from Ala-tRNACys be incorporated?

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#Question id: 29452

#Unit 6. System Physiology – Plant

Auxins in biological samples can be determined by

a. bioassay

b. mass spectrometry

c. enzyme-linked immunosorbent assay 

d. The Avena coleoptile curvature assay

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#Question id: 4223

#Unit 3. Fundamental Processes

Use the figure to answer the question. Refer to the metabolic pathway illustrated. If A, B, and C are all required for growth, a strain that is mutant for the gene-encoding enzyme A would be able to grow on medium supplemented with which of the following nutrient(s)?

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#Question id: 19073

#Unit 6. System Physiology – Plant

Bacteria releases toxin or effectors, which triggered immune response in the host plant, known as__

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#Question id: 18623

#Unit 13. Methods in Biology

Which of the following PCR has been devised to increase the specificity of PCR without lowering the efficiency