One of the functions of skin is the synthesis of vitamin D. Which of the following would be evidence for this function?
A) Vitamin D levels are higher in people who take supplements, such as multivitamins.
B) Vitamin D levels are lower in people who wear sunscreen.
C) Cancer rates are higher in people with more sun exposure.
D) People living in the tropics are vitamin D deficient.
Answer: B
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Which system(s) control digestion?
a. the nervous system b. the endocrine system c. both the nervous and endocrine systems d. the lymphatic system e. both the nervous and lymphatic systems
Adaptations that have enabled vertebrates to survive on land include all of the following EXCEPT
A. a water-resistant epidermis B. development of a bony skeleton C. development of longs D. external fertilization E. embryos enclosed within membranes
At 4:00 p.m. a closed flask is inoculated with 1,000 cells. The lag phase lasts 1 hour. At 9:00 p.m. the culture enters stationary phase with a population of 65 million cells. The number of generations that have occurred is
a. 15. b. 16. c. 17. d. 18.
Which of the following statements is true of selective toxicity?
A) Selective toxicity takes advantage of structural similarities between host and pathogen. B) To be effective, an antimicrobial agent must be more toxic to the patient than the pathogen. C) Selective toxicity takes advantage of differences in metabolic rates of the host and pathogen. D) Selective toxicity damages only pathogenic bacteria and not beneficial bacteria. E) Selective toxicity takes advantage of structural and/or metabolic differences between host and pathogen.