Exam 15: Biosynthesis

Tryptophan is among the so-called essential amino acids for humans, as we cannot produce it ourselves. Briefly describe tryptophan biosynthesis in bacteria. Why is it so energetically expensive to synthesize this aromatic amino acid?

The catalytic site of Rubisco is located in

Which of the following is NOT correct regarding nitrogen assimilation into biomass?

Which of the following pathways is NOT a route for CO₂ assimilation?

How does the reductive (reverse) TCA cycle participate in carbon fixation?

An association between two Antarctic microorganisms is pictured below. It provides an interaction that supplies ________, made by the ________, to the ________.

The amino acid biosynthetic pathways are designated as families. The ________ family generates only one amino acid.

Many of the antibiotics and other pharmaceutical agents isolated from Streptomyces species are

What are polyalkanoates, and what are bacterially produced polyalkanoates used for? Why are they of ecological and medical interest?

Which of the following is NOT correct regarding unsaturation in certain fatty acids?

Two strains of E. coli were developed, each of which overproduced an amino acid, either histidine or tryptophan. When grown together in medium with adequate amino acids, they grew but did not associate with each other. When these strains were grown together in medium without histidine and tryptophan, they grew and formed ________ in order to ________.

Nitrogenase is diagrammed below. This particular enzyme is shown in the format just before it begins a cycle of nitrogen reduction. This goal is accomplished in four steps. What is the first step?

The Calvin cycle is essentially