Contaminants such as personal care products and pharmaceuticals are an emerging concern in wastewater treatment for ALL of the following reasons EXCEPT which one?
a. They are continuously discharged, so they can have environmental effects even if they do not persist.
b. They are persistent in the environment.
c. These compounds are often present in high concentrations and can support microbial growth.
d. They can inhibit bacterial activity during secondary treatment.
Answer: A
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Explain the phenomenon known as diauxic growth. Hypothesize why this type of regulation might be important for survival of a microbe in a community as well as a situation where lacking it might be advantageous
What will be an ideal response?
If a toxin blocks the receptors for the neurotransmitter on the postsynaptic muscle cell,
____________________.
a. paralysis will occur b. the person will have a seizure c. the action potential in the presynaptic cell fails d. calcium, which can function as a neurotransmitter, will be released
Pituitary dwarfism may be caused by reduced production of:
a. mineralocorticoid b. glucocorticoid c. calcitonin d. growth hormone e. the parathyroid hormone
In which situation might methylation of membrane proteins in Escherichia coli initiate a phosphorelay system that evokes clockwise rotation of flagella?
A. Utilization of lactose due during diauxic growth B. Presence of a chemorepellent in the extracellular environment C. Change in environmental osmotic pressure D. Cellular population reaches a quorum