An instrument that will come into contact with only the skin of a patient should be disinfected with a(n)

A. high-level germicide.
B. low-level germicide.
C. intermediate-level germicide.
D. degerming agent only.
E. germistatic agent only.


Answer: B

Biology & Microbiology

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Which of the following statements best describes the habitats of Acidovorax, Sphingobacterium, and Sphingomonas?

a. Habitats are limited to the upper respira-tory tract of various mammals. b. Habitats are unknown. c. Habitats are limited to the soil and water environment. d. Habitats are limited mostly to water sources.

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Individuals heterozygous for the RB+ and RB? alleles can develop tumors as a result of (Select all that apply.)

A) a mitotic crossover that leads to homozygosity for RB+ in some cells and RB? in other cells. B) a somatic mutation in the RB+ allele that leads to homozygosity for RB?. C) a somatic mutation in the RB? allele that leads to homozygosity for RB+. D) the fact that RB? is dominant to RB+.

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Foraminiferan shells are made of

A. cellulose. B. chitin. C. calcium carbonate. D. peptidoglycan. E. silica.

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Which of the following organs of the endocrine system secretes thyroxine and calcitonin?

a. pituitary gland b. pancreas c. hypothalamus d. adrenal glands e. thyroid gland

Biology & Microbiology