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Question: Two protein kinases, PK1 and PK2, work sequentially in an intracellular signaling pathway. You create cells that contain inactivating mutations in the genes that encode either PK1 or PK2 and find that these cells no longer respond to a particular extracellular signal. You also create cells containing a version of PK1 that is permanently active and find that the cells behave as though they are receiving the signal even when the signal is not present. When you introduce the permanently active version of PK1 into cells that have an inactivating mutation in PK2, you find that these cells also behave as though they are receiving the signal even when no signal is present.From these results, does PK1 activate PK2, or does PK2 activate PK1?
In a testcross of Aa Bb CC Dd Ee FF where the genes demonstrate independant assortment and determine the expected frequency of aa bb Cc dd ee Ff progeny?
A calorie is the amount of heat required to raise the temp of one gram of water by 1°C (1 cal = 4 J). A marine iguana from the Galapagos Islands weighs about two kg.
A drug that does not dissociate has a molecular weight of 300. If 300 g of this drug are dissolved in 1000 ml of water, determine the osmolarity of resulting solution?
During replication of viral DNA of members of the Polyomaviridae, a pair of T antigen hexamers forms a preinitiation complex at the origin for viral DNA replication.
Cancer patients undergoing chemotherapy are normally more susceptible to infections. However, a patient receiving an antitumor drug that inhibited cell division was resistant to salmonella. Provide a possible mechanism for the resistance.
Discuss and explain a parallel arrangement of the circulatory system and why is it functionally important?
Suppose that the lengths of the double-helical regions and the lengths of the single-stranded regions in them vary within relatively tight limits.
How many dissimilar types of gametes can be produced. how much of drug will stay 6 hours after its administration.
Estimate how many photons of light are minimally required to build one glucose molecule in photosynthesis and describe your answer
Suppose a population evolving by genetic drift in which the frequency of allele K is 0.65. What is the probability that at some point in the future allele K will drift to a frequency of 1?
Explain why is agar typically used as a solidifying agent in microbiological media instead of gelatin? What could happen if gelatin was used?
A can of Mountain Dew soda contains 46 g of sugar. Assume that your body completely digests this sugar, 170 kcal of heat energy is available from the sugar. Around how many grams of water will you have to evaporate as sweat to lose this 170 kcal of e..
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