You discover a mutant strain of Neurospora crassa that will not grow on a minimal medium but that will grow on a medium supplemented by the amino acid methionine
How can you determine which step in the methionine synthesis pathway is affected by the mutation?
You would grow the strain on a series of media each supplemented with a chemical intermediate in the methionine biosynthetic pathway and observe for growth. The mutant will be able to grow on any medium that contains an intermediate substance in the pathway that comes after the step controlled by its mutant gene. It will also accumulate the intermediate compound used in the step where it is blocked.
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Membrane potential will affect the directional movement of
A. Glucose (C6H12O6) B. Cholesterol C. Potassium (K+) D. Oxygen (O2)
Answer questions 38–42 in reference to the four “habitat” items
listed below. a. habitat fragmentation b. habitat island c. habitat loss d. habitat M 38. This describes where a species lives. M 39. This reduces a habitat’s area, making species more vulnerable to extinction. M 40. This could be the result of chemical pollution. D 41. This is an inhabited area surrounded by unsuitable habitat. D 42. This action may result in a lack of sufficient resources to sustain the population.
In which stage of the cell cycle is G0 located?
What will be an ideal response?
The stimulus that causes the parathyroid glands to secrete parathyroid hormone is ________
Fill in the blank(s) with the appropriate word.