How does cAMP affect the expression of the lac operon?
A. cAMP binds to the CRP, decreasing its affinity for a DNA site near the promoter.
B. cAMP binds to the CRP, increasing its affinity for a DNA site near the promoter.
C. cAMP binds to the Lac repressor, decreasing its affinity for a DNA site near the promoter.
D. cAMP binds to the Lac repressor, increasing its affinity for a DNA site near the promoter.
B
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The molecular explanation for narcolepsy is that
A) certain brain cells have many extra orexin/hypocretin receptors, so these cells receive too many messages to sleep. B) the orexin/hypocretin receptor does not reach the cell surfaces of certain brain cells. C) a gene is missing in chromosome 6 that encodes the protein narcoleptin. D) a viral infection activates genes that promote sleep.
Infecting people with ________ led to vaccination against smallpox.
A) chickenpox virus B) swine flu virus C) cowpox D) measles virus
Which of the following is a genetically modified crop species?
a. corn b. peppers c. radishes d. asparagus
Which of the following statements regarding lateral gene transfer is INCORRECT?
a) Lateral gene transfer increases the genetic variability of species. b) Lateral transfer makes it difficult to identify the boundaries of different bacterial species. c) With the exception of the endosymbiosis events that gave rise to mitochondria and chloroplasts, lateral gene transfer does not occur in eukaryotes. d) Lateral transfer can occur through the ability of some species to absorb naked DNA fragments from the environment. e) Lateral gene transfer is rarely mediated by viral infections.