Explain what a mutator gene is and give an example
What will be an ideal response?
A mutator gene is a gene in which a mutation results in a much higher-than-normal mutation frequency for all other genes. For example, mutD mutations in E. coli affect the function of DNA polymerase III. This causes defective 3'-to-5' proofreading repair activity and results in many incorrectly inserted nucleotides being left unrepaired.
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A doctor wants to determine the origin of the bacteria in the intestinal tract of one of her patients. How can she do this?
A. by examining the bacteria present in the eggs of the patient's mother B. by examining the bacteria present in the sperm of the patient's father C. by determining the bacteria present in the food the patient eats D. All of these answer options are correct.
The cAMP-CAP complex and RNA polymerase bind more efficiently to the lac operon together than either does alone. What term is applied to this increased efficiency of binding?
What will be an ideal response?
All of the following increase genetic variation EXCEPT
A. crossing over. B. random fertilization. C. independent assortment. D. mitosis. E. mutation.
Which plant tissue may play a role in photosynthesis, nutrient storage, and plant structure?
A) meristematic B) ground C) dermal D) vascular