How does temperature affect rate of an enzymatic reaction? Why are severe fevers dangerous?
What will be an ideal response?
Adding heat boosts free energy, which is why molecular motion increases with temperature. The greater the free energy of reactants, the closer they are to activation energy. Thus, the rate of an enzymatic reaction typically increases with temperature—but only up to a point. An enzyme denatures above a characteristic temperature. Then, the reaction rate falls sharply as the shape of the enzyme changes and it stops working. Body temperatures above 42C (107.6F) adversely affect the function of many of your enzymes, which is why severe fevers are dangerous.
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Which of the following is true regarding DNA replication?
A. Only the lagging strand gets shortened during replication. B. Only the leading strand gets shortened during replication. C. Both strands get shortened at the same end during replication. D. Both strands get shortened at opposite ends during replication. E. Only the lagging strand gets shortened after every other round of replication.
Signal transduction
A. is the relay of information about conditions outside a cell to inside the cell. B. often relies on a two component system. C. may involve phosphorylation of various molecules. D. is used by certain pathogens to sense low magnesium conditions. E. All of the choices are correct.
All plants are multicellular, and most are ____ that carry out photosynthesis
a. freshwater autotrophs b. freshwater heterotrophs c. marine autotrophs d. terrestrial autotrophs e. terrestrial heterotrophs
Which of the following develops into a seed?
a. megaspore b. ovary c. egg d. ovule e. anther