Penicillin is a competitive inhibitor produced by a fungus in order to kill invading bacteria. It does this by mimicking the substrate required by the bacterium to build and repair its cell wall. Describe how mimicking the substrate would result in the death of the bacterium.
What will be an ideal response?
As a competitive inhibitor, it must bind to the active site of the bacterial enzyme where the correct substrate typically binds. Binding to the active site blocks the correct substrate from binding and prevents the correct products from being formed. Without these products, the bacterium cannot repair its cell wall and consequently dies.
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Which mechanism is the least likely explanation for high chromosome numbers in ferns?
a. dysploidy b. polyploidy c. increased independent assortment d. increased recombination rates e. homospory
Cells that are not dividing remain in the
A.) Mitosis Phase B.) Synthesis Phase C.) First Gap Phase D.) Second Gap Phase
The genus Arthrobacter ________.
A. is a significant component of the microbial flora of soil and plays an important role in the degradation of some herbicides and pesticides B. is a significant component of the microbial flora of soil C. forms heat-resistant endospores D. plays an important role in the degradation of some herbicides and pesticides
When is knowing the host and environmental factors that lead to a disease more important to saving lives than knowing the etiological causative agent?
A) when the host range is very large B) when the disease is spread through sexual contact C) when there is no cure for the disease D) when specific health factors within a person's control are particularly risky E) when the source of infection is a particular geographical location