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Chapter 22: Q. 16 (page 570)
Which of the following elements is not a micronutrient?
a. boron
b. calcium
c. chromium
d. manganese
The one which is not a micronutrient is calcium.
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Which of the following statements about the nitrogen cycle is false?
a. Nitrogen fixing bacteria exist on the root nodules of legumes and in the soil. b. Denitrifying bacteria convert nitrates (NO3 - ) into nitrogen gas (N2 ).
c. Ammonification is the process by which ammonium ion (NH4 + ) is released from decomposing organic compounds.
d. Nitrification is the process by which nitrites (NO2 - ) are converted to ammonium ion (NH4 + ).
Many of the first prokaryotes to be cultured in a scientific lab were human or animal pathogens. Why would these species be more readily cultured than non-pathogenic prokaryotes?
a. Pathogenic prokaryotes are hardier than nonpathogenic prokaryotes.
b. Non-pathogenic prokaryotes require more supplements in their growth media.
c. Most of the necessary culture conditions could be inferred for pathogenic prokaryotes.
d. Pathogenic bacteria can grow as free bacteria, but non-pathogenic bacteria only grow as parts of large colonies.
In addition to providing yogurt with its unique flavor and texture, lactic acid-producing bacteria also provide which additional benefit during food production?
Select one:
a. Providing xenobiotics
b. Lowering the pH to kill pathogenic bacteria
c. Pasteurizing milk products
d. Breaking down lactose for lactose-intolerant individuals
Many people use antimicrobial soap to kill bacteria on their hands. However, overuse may actually increase the risk of infection. How could this occur?
A person in England arrives at a medical clinic with a fever and swollen lymph nodes shortly after returning from a visit to New Mexico. For which bacteria should the doctor test the patient?
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