You modify the primary sequence of an enzyme in a region that will be the active site when the protein is properly
folded. What is the predicted outcome of this change?
a. The enzyme will not bind to the substrate properly.
b. The enzyme will not be able to bind an allosteric inhibitor.
c. The enzyme will have an increased rate of activity.
d. There will be no change in the enzyme's function.
e. The enzyme will bind the substrate but not be able to release the products.
ANSWER: a
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Fly species W, found in a certain part of the island, produces fertile offspring with species Y. Species W does not produce fertile offspring with species X or Z. If no other species can hybridize, then which of the following statements about species W
and Y are true? I) Species W and Y have genomes that are still similar enough for successful meiosis to occur in hybrid flies. II) Species W and Y have more genetic similarity with each other than either did with the other two species. III) Species W and Y may fuse into a single species if their hybrids remain fertile over the course of many generations. A) Only I is correct. B) Only II is correct. C) Only III is correct. D) I, II, and III are correct.
All of these phyla are deuterostomes except for the:
1.Chordata 2.Echinodermata 3.Hemichordata 4.Nemertea
The resting potential across a typical neuron
membrane is approximately __________ inside relative to outside. a. -70 microvolts b. -70 millivolts c. -70 volts d. +70 millivolts e. +70 megavolts
The main weight-bearing bone in the lower extremities is known as the ________
A) fibula B) femur C) pelvis D) tibia