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Q1. The functional lac repressor is a homoteramer. Still, the X-ray structure of lac repressor bound to the lac operator sequence centered at +11 reveals that the two half sites that constitute the complete operator sequence with two-fold rotational symmetry are each bound by a monomeric subunit of the repressor. If repressor tetramer uses only two of its subunits to bind to an operator sequence, why is tetramer formation so important to the control of lac operon gene expression?
Q2. The counter current exchange respiratory system of fish, which of the next would not be expected?
1. Blood flows through the gills from anterior to posterior. 2. Water travels over the gills from anterior to posterior. 3. In the back (posterior) portion of the gill, amount of carbon dioxide in the gills is higher than the water. 4. In the front (anterior) portion of the gill, amount of oxygen in the gills is lower than the water.
What are the most probable genotypes of the male and female parents? Give details the strategy used to determine the genotypes. What is the probability of the subsequently offspring having a spotted brown tail.
Recently, use of cleaner fuels has greatly reduced soot in the landscape, and dark-coloured moths have been disappearing. Should the two forms of moths be considered separate species.
Her breath smells like acetone and her blood glucose test out at 650mg/100ml of blood. She is in acidosis. What hormone must be administered to her and why. Where may she find such DNA.
At the end of the measurement period, which group will have produced the greatest volume of urine and which group the minimum? Describe your answer in details.
Is this organism recovered more frequently as a nosocomial pathogen, as a community-acquired pathogen, or at similar rates in both settings? Elucidate your choice.
What part of the sewage treatment plant deals with insoluble and complex organic wastes? Which molecule contains more energy, X or Y.
What veins are most likely involved? What pathologic changes have happened in these veins, and what is the most probable cause in this patient's case.
What organism is most probable the cause of the symptoms. What is cause the man's disease? How is this disease transmitted? How may it be prevented.
The organism may well potentially be a crab, a shrimp, a barnacle, or a bivalve. The presence of which structures would allow for the most certain identification of the organism.
Indicate how the landfill under construction will be superior to the old landfill for each difference. Plan a new product. "Build" your new product.
Explain at least one historical extinction with parallels to the extinction threats facing the bog turtle. When allosteric effector X binds to enzyme #1, enzyme stops working. However, the speed of reaction can be altered by adjusting the concentrati..
What must the intracellular 3-phosphoglycerate/1, 3-diphosphoglycerate ratio be to make the phosphoglycerate kinase reaction thermodynamically favourable in the direction of 1, 3-diphosphoglycerate synthesis.
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