Which of the following statements about staphylococcal food poisoning is FALSE?

A) It is caused by ingesting an enterotoxin.
B) It can be prevented by adequate refrigeration of food.
C) It can be prevented by heating foods to 50°C for 15 minutes.
D) It is treated by replacing water and electrolytes.
E) It is characterized by rapid onset and short duration of symptoms.


C

Biology & Microbiology

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Among vertebrate animals, urea is _____

A) made in the kidneys and immediately excreted B) added to the air in the lungs to be exhaled, along with carbon dioxide C) made in the liver by combining two ammonia molecules with one carbon dioxide D) made in the pancreas and added to the intestinal contents, along with bile salts, for excretion E) rarely the nitrogenous waste

Biology & Microbiology

Which feature is necessary for a scientific hypothesis?

A) It is able to be proven true. B) It is falsifiable. C) It is a theory about something. D) It is not based on observations.

Biology & Microbiology

Dalton’s law of partial pressures states that the total pressure of a mixture of gases is equal to the sum of the pressures

of the individual gases. Indicate whether the statement is true or false.

Biology & Microbiology

Scientists have warned doctors of the danger of their increasing use of antibiotics (for instance, penicillin) for treating minor illnesses. They are concerned because ____________.

A) humans will become tolerant to the effects of drugs B) excessive use of these drugs leads to a diminished sensitivity to them C) strains of microorganisms that are resistant to these drugs will be selected D) the drugs will be metabolized more quickly by our bodies, decreasing their effectiveness E) none of these

Biology & Microbiology