Saturation can be defined as
A) denaturation of an enzyme.
B) the inability to increase reaction velocity beyond a finite upper limit.
C) inhibition of enzyme function by blocking the active site.
D) the substrate concentration at which velocity reaches one-half maximum velocity.
E) a characteristic of all uncatalyzed reactions.
Answer: B
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Which of the following would occur if a cell's splicesomes were mutated so they no longer functioned normally?
A. Introns would remain in the mature mRNA. B. Exons would be missing in the mature mRNA. C. Transcription would cease. D. A functional protein would still be produced. E. RNA processing would remain intact.
Rattlesnakes strike and inject venom into prey and then release the prey item and follow it
until the venom takes its effect. Typically, rattlesnakes strike at the base of the skull, and their strike accuracy is very high. Because the brain is very active, it produces a lot of heat, and this is detected by the snakes with __________ located in pit organs on the anterior region of the head.
a. thermoreceptors b. photoreceptors c. chemoreceptors d. pain receptors
The main features that place Homo habilis in the genus Homo rather than Australopithecus are
A. hand grip, extensive use of tools, and house-building. B. care of young and altruistic behavior. C. human facial appearance and lack of hair. D. brain size, dentition, and tool use. E. advanced use of language and total carnivorous diet.
Proteins function in modern cells as ________.
A. both catalysts and structural elements B. structural elements C. hereditary information D. catalysts