You identify an enzyme involved in a cellular reaction. How does the enzyme affect the reaction equilibrium between reactants and products and the time needed to reach equilibrium?
A. The reaction equilibrium is unaffected, but it lengthens the time needed to reach equilibrium.
B. The reaction equilibrium is unaffected, but it shortens the time needed to reach equilibrium.
C. It alters the reaction equilibrium and shortens the time needed to reach equilibrium.
D. It alters the reaction equilibrium and lengthens the time needed to reach equilibrium.
Answer: B
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A population of mountain goats are split because of the formation of a glacier. After 500 years the glacier melts and the two goat populations are free to move between the two areas. Under what conditions might a hybrid zone occur?
A. Both pre-¬ and post-¬zygotic isolating mechanisms have arisen. B. Reproductive isolation is incomplete. C. Pre-¬zygotic isolating mechanisms have arisen. D. Post-¬zygotic isolating mechanisms have arisen. E. Gene flow between the two populations does not occur.
Suppose you discover a new species of worm that exists in two forms—slimy and nonslimy. You find that mating slimy females to nonslimy males produces offspring consisting of slimy males and nonslimy females, whereas mating nonslimy females with slimy males produces offspring of both sexes that are all slimy. You would conclude that the ________ allele is dominant and that ________ are the heterogametic sex (the sex with two different sex chromosomes) in this species of worm.
A) slimy; females B) slimy; males C) nonslimy; females D) nonslimy; males
The "big bang" refers to
a. an event marking the beginning of the universe. b. the extinction of the dinosaurs. c. the inevitable end of the universe. d. the collision of the first galaxies forming the universe as it is today. e. the inevitable death of large stars
Your research team has been asked to quantify levels of cellular RNAs in rats before and after exercise. The primary focus of your work will be to analyze the
A. nucleosome. B. spliceosome. C. transcriptome. D. proteome. E. different RNA motifs.