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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 environmental conditions would favor plant species with a strategy of producing many small seeds rather than a few large ones? What classification would we give to species utilizing one of these two strategies? Name and describe each.
At 4.00 rm L, an expandable vessel contains 0.864 rm mol of oxygen gas. How numerous liters of oxygen gas should be added at constant temperature and pressure if you require a total of 1.96 mol of oxygen gas in the vessel.
When did dinosaurs and pterosaurs become extinct? Which are the only extant animals that descended directly from dinosaurs.
Some microbiologists recommend incubating this medium at 37 degrees, along with an uninoculated control,and then transfering all tubes to the refrigerator prior to reading them.why might this be preferred technique in some situations? What potenti..
Describe the etiology and genetics of the disease phenylketonuria (PKU). Phenylketonuria (PKU) refers to a disease found in the humans in which the affected individual does not have enzyme phenylalanine hydroxylase.
find the ratio of acid to base for each titratable group.
Most hormones have a basal level of secretion that can increase or decrease based on some condition of change that is detected by endocrine receptor.
In humans, the Xbr gene is located on chromosome 12 and is responsible for the production of a protein involved in liver function. There are 3 different alleles of the Xbr gene that exist in the human population: Xbr1, Xbr2, and Xbr3.
what would be the resulting mRNA and peptide sequence?
Given the similarity in the appearances of puromycin and phenylalanyl-tRNA and the fact that puromycin prevents the elongation of a growing polypeptide by entering the A site instead of phenylalanyl-tRNA, as what kind of inhibitor would it be most..
What caused the symptoms? What treatment has to have been administered in July? What treatment must be administered 2 years later.
q1. think of the beavers digestive organ system. describe its overall role. listing several of the organs in this
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