Which sentence best describes the situation that occurs when an enzyme and its substrate interact?
a. Just after substrate binding, the enzyme changes its shape (conformation) so that the active site becomes even more precise in its ability to bind the substrate.
b. Just before substrate binding, the enzyme changes its shape (conformation) so that the active site becomes even more precise in its ability to bind the substrate.
c. Just before substrate binding, the substrate changes its shape (conformation) so that the active site becomes even more precise in its ability to bind the enzyme.
d. Just after substrate binding, the substrate changes its shape (conformation) so that the active site becomes even more precise in its ability to bind the enzyme.
Ans: b. Just before substrate binding, the enzyme changes its shape (conformation) so that the active site becomes even more precise in its ability to bind the substrate.
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A student sitting in the back row opened a bottle of foul-smelling perfume and dabbed it on her wrists. One by one (beginning from the back of the room) the students began to cough due to the foul smell. This phenomena was due to
A. an allergic reaction. B. osmosis. C. molecules moving from an area of low concentration to high concentration. D. diffusion. E. active transport.
Which of the following methods is used by plants when they are undergoing asexual reproduction?
A. Development of rhizomes. B. Production of stolons. C. Growth of suckers from the root base of specific types of trees. D. All of the answer choices are methods of asexual reproduction in plants.
What are the results of double fertilization?
A) Egg cell and sperm cell B) Diploid zygote and diploid endosperm C) Embryo sac and pollen sac D) Triploid endosperm and diploid zygote E) A zygote and an embryo
Among children with parents who are both carriers of Tay-Sachs, an autosomal recessive disorder, chances are that
a. 75 percent will be carriers. b. 50 percent will die in a few years. c. 75 percent will not carry the recessive Tay-Sachs's allele. d. 50 percent will be carriers.