Wild type bread mold can grow in a minimal medium without supplements, while certain mutated strains can only grow in a minimal medium that is supplemented with specific intermediates. See the figure below for an overview of the arginine biosynthetic pathway.A strain that can grow in a minimal medium containing arginine, but NOT in minimal media containing citrulline nor in minimal media containing ornithine would have a mutation in the gene that encodes for ________.
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A. enzyme 2.
B. enzyme 1.
C. both enzymes 2 and 3.
D. both enzymes 1 and 3.
E. enzyme 3.
Answer: E
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A certain species of pine tree survives only in scattered locations at elevations above 2800 meters in the western United States. To understand why this tree grows only in these specific places, an ecologist should _____
A) conclude that lower elevations are limiting to the survival of this species B) study the anatomy and physiology of this species C) investigate the various biotic and abiotic factors that are unique to high altitude D) analyze the soils found in the vicinity of these trees, looking for unique chemicals that may support their growth E) collect data on temperature, wind, and precipitation at several of these locations for a year
Children born with fetal alcohol syndrome have
A. cognitive disorders. B. three copies of chromosome 21. C. a gap between the mouth and nasal cavity. D. a gap in the posterior region of the neural tube. E. All of the above.
All of the following are inputs to the electron transport chain EXCEPT
a. an H-carrier. b. oxygen. c. ADP. d. water.
Nausea is an example of a (sign/symptom/syndrome) of disease
What will be an ideal response?