Nutritional mutants in Neurospora can be "cured" by treating the medium with substances in the defective metabolic pathway. What determines whether the mutant strain (auxotroph) is "cured" by a particular substance?
What will be an ideal response?
The substance needs to be added after the metabolic block in the biochemical pathway.
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Both hydrophilic and charged molecules readily diffuse through the cytoplasmic membrane
Indicate whether the statement is true or false.
Which of the following statements about freshwater bony fish is false?
A. They drink water to replenish water supplies. B. Chloride cells in the gills actively pump chloride ions into the body. C. They are osmoregulators. D. They tend to gain water through osmosis. E. They maintain body fluid solute concentrations that are higher than that of the surrounding water.
The preferred host of Ixodes scapularis is the
A. wood rat. B. white-footed mouse. C. moose. D. human.
Sickle cell anemia has been traced to what type of mutation?
a. frameshift b. transposable element c. deletion d. addition e. base substitution