Which of the following is the correct order of steps for the CRISPR-Cas mechanism?
A) cleavage, target interference, biogenesis
B) target interference, transcription, biogenesis
C) spacer acquisition, biogenesis, target interference
D) transcription, cleavage, spacer acquisition
Answer: C
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How did researchers explain the smaller size of sexual maturity for guppies in some Trinidad streams?
a. Some low-quality streams have small carrying capacities, which forces guppies to reach sexual maturity more quickly b. Smaller streams require that individual fish be smaller at sexual maturity. c. Smaller sexually mature guppies were those that had hybridized with killifish, another small fish found in Trinidad. d. When predators select larger fish, the smaller fish reaching sexual maturity will experience increased fitness.
Which of the following is NOT property of enzymes?
a) they are required in large amounts b) they have no effect on the thermodynamics of the reaction c) they are not altered irreversibly during the course of the reaction d) the reactants bound by an enzyme are called substrates
A significant event influencing the rapid evolution of plants on land after their initial appearance was the ____.
A. increase of atmospheric oxygen B. reduction of ultraviolet radiation penetration through the atmosphere C. stabilization of global climates D. increase in soil nutrients E. merging of land masses
If a pathogen penetrates nonspecific physical and chemical surface barriers, it breaks through the ________
A) first line of defense B) first and second lines of defense C) second line of defense D) third line of defense