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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.
Mimulus lewisii and Mimulus cardinalis are two plants that occupy the same habitat but do not interbreed in nature. Though, they can be readily crossed in the laboratory to produce fertile offspring. Which is a likely reason that prevents interbreedi..
A man and a woman are both carriers for 2 autosomal recessive disorders, PKU and cystic fibrosis. If they have a daughter, what is the possibility that she will have PKU but not cystic fibrosis.
What fraction of offspring of the cross AabbDd x AaBbdd are expected to have the same phenotype as either one of their parents assume that all three genes are on different chromosomes.
What aspects of the native organ function are replicated, and which are not? (this should include a quantitative analysis of function, for example filtration rates in artificial kidney compared to natural kidney)
Which will you expect to increase significantly from M to G1. What does this tell you about how the cellular information for eye colour is pass on? Describe in detail.
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.
When a tropical moth is touched on the thorax it lifts its forewings up abruptly, exposing its brightly coloured hind-wings. What causes the moth to behave this way? What significance can we attach to the fact that the verbal ability scores of ado..
About how long at the earliest is it likely to take before he gets feeling back in that part of thumb. Give two reasons that the wolf population is not at Hardy-Weinberg equilibrium.
What combination(s) of chromosomes are possible in haploid cells following both divisions of meiosis? (Hint: remember independent assortment). A diploid cell contains three pairs of homologous chromosomes designated C1 and C2, M1 and M2, and S1 and S..
Diplomonads, such as Giardia contain two haploid nuclei per trophozoite. Thus, During the G1 phase of the cell cycle, there should be a total of how several unreplicated chromosomes per trophozoite, and throughout the G2 phase, how many replicated ch..
Why may selfing be selected for in nature yet still be an ‘evolutionary dead end'. How many kilocalories must Janine eat each day to maintain her present body weight.
How did the rmp change with the low na ecf solution. Discuss at least three practical, scientific, and ethical issues that may be raised by such a change in naming.
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