A mutant you made in the laboratory with 5-bromouracil suddenly regains the wild-type phenotype. You discuss this phenomenon with your advisor and colleagues, and they suggest you try transposon mutagenesis to avoid this problem and create stable mutants
Why would mutants created with 5-bromouracil be more likely to regain the wild-type phenotype than mutants created via transposon mutagenesis?
What will be an ideal response?
Answer: Because a point mutation involves only a single base pair change, reversion is quite common relative to fixing an insertion of several nucleotides. Also common in Bacteria are suppressor mutations, which suppress the initial mutation and restore the wild-type phenotype (but not genotype) of a point mutation. However no analogous mechanism works to fix large-scale insertions or deletions.
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When a mycelium infiltrates an unexploited source of dead organic matter, what are most likely to appear within the food source soon thereafter?
A) fungal haustoria B) soredia C) fungal enzymes D) increased oxygen levels E) larger bacterial populations
Contraction of the diaphragm causes
A. a person to exhale. B. the size of the chest cavity to increase. C. air to flow from the lungs to the outside. D. compression of the lungs.
A change in a single amino acid can change the structure and function of an entire protein. However, in some cases, there can be gene mutations, which change an amino acid in a protein structure but do not change either the overall shape or function of a protein. In cases like these, which level(s) of protein structure would change?
A. none B. primary, secondary, tertiary, and quaternary C. secondary and tertiary D. primary
Which of the following infectious disease transmission modes is not correctly paired with an example?
A) windborne: cholera B) breast milk: HIV C) flea bite: Plague D) touching: cat-scratch fever E) swimming: swimmer's ear