All of the following factors contribute to hospital-acquired infections EXCEPT
A) some bacteria metabolize disinfectants.
B) gram-negative bacteria are often resistant to disinfectants.
C) invasive procedures can provide a portal of entry for bacteria.
D) bacteria may be present in commercial products such as mouthwash.
E) None of the answers is correct; all of these factors may contribute to hospital-acquired infection.
E
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Genetic studies have identified an allele (32) that seems to provide protection against AIDS. Which of the following would most likely explain the reason why our population has this mutation?
A. Our bodies are designed to protect us against a myriad of pathogens. Our immune system was preparing for future viruses. B. This mutation likely benefited the human population against some other early pathogen. C. This mutation was initially harmful, but it now affords us protection against AIDS. D. Mutations that become prominent in a population initially were neutral but then become advantageous later on.
Which of the following is TRUE of the hormone glucagon?
A. It is synthesized in the pancreas. B. It stimulates glycogenolysis by the liver. C. It stimulates gluconeogenesis by the liver. D. It is released in response to low blood glucose levels. E. All of the answers provided are correct.
Which of the following vitamins is water-soluble and cannot be stored in the body?
a. A b. D c. C d. E e. K
Hormonal regulation of digestive functions is an example of the interaction between the digestive
system and which other system? a. nervous b. reproductive c. cardiovascular d. integumentary e. endocrine