Biology, 18.05.2021 01:50, manco6

What is Tay-Sachs syndrome? Sickle-cell anemia? PKU?

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Biology, 22.06.2019 02:50, mccay5016987

Keeping in mind the life cycle of bacteriophages, consider the following problem: during the reproductive cycle of a temperate bacteriophage, the viral dna inserts into the bacterial chromosome where the resultant prophage behaves much like a trojan horse. it can remain quiescent, or it can become lytic and initiate a burst of progeny viruses. several operons maintain the prophage state by interacting with a repressor that keeps the lytic cycle in check. insults (ultraviolet light, for example) to the bacterial cell lead to a partial breakdown of the repressor, which in turn causes the production of enzymes involved in the lytic cycle. as stated in this simple form, would you consider this system of regulation to be operating under positive or negative control?

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Biology, 22.06.2019 09:30, imaboss10986

Consider the following reaction: 2h2 + o2 —> 2h2o a) what are the reactants in this reaction? b) what are the products in this reaction? c) how many molecules of oxygen are used in this reaction?

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Biology, 22.06.2019 13:30, sabinaschaaf10

What is any method of measuring the age of an object or event in years, such as using atomic half-life?

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Biology, 22.06.2019 14:00, treavonknorton

Vinegar has a ph of 3, and household ammonia has a ph of 11. is the concentration of h+ greatest in the vinegar or ammonia?