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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 is the maximum number of different alleles of the Xbr gene that a genetically normal person can have in the genome of one of their skin cells?
a. 3b. 2c. 6d. 4e. none
Two intracellular molecules A and B are continually synthesised at a constant rate of 1000 per molecule per cell. Each molecule of A survives an average of 100 seconds. While each molecule of B survives an average of 10 seconds.
Explain how to make 50 ml of the following 10X Gel electrophoresis loading buffer, 100 mM EDTA (pH 8.0), 0.1 percent and find mature mRNA.
When did dinosaurs and pterosaurs become extinct? Which are the only extant animals that descended directly from dinosaurs.
The picture below shows xylem and phloem tissue in a stem. Arrows show the direction of movement of water (gray arrows) and sugar (black arrows). Using your knowledge of water potential,
Discuss the differences between a gymnosperm's secondary growth and an angiosperm's secondary growth? how could you tell the stems apart?
Meselson and Stahl performed the density-gradient centrifugation of DNA in a solution of calcium chloride. Chargaff's rule state that in DNA, the amount of adenine equals
What effects may the reintroduction of wolves have on the ecological communities in the region? What might be done to mitigate the conflicts between ranchers and wolves.
Think about a virus with a plus strand RNA genome 8 kb in length, which encodes eight proteins. Determine which of the following is a known mechanism for producing all eight proteins from this genome?
The streak-stab technique, used to promote streptolysin activity, is preferred over incubating the plates anaerobically. Why do you think this is so?
When the sperm cell unites with egg cell this is known as ______. Usually, this happens in the ______. After four or five days, the developing zygote arrives the uterus.
define Globular cluster of noncontiguous segments. Final three-dimensional packaging of all three regions of a single polypeptide chain.
While a tall homozygous plant was crossed with a short homozygous plant, the F1 offspring were all tall. No short plants were present in the F1 generation. Which principle does this situation represent.
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