A hospital burn unit has experienced ongoing problems with pseudomonad infections in multiple wards despite attention to patient hygiene and environmental sanitation. Which of the following would not be a possible source of the bacteria?
A) hospital floral shop
B) skin microbiota of staff
C) hospital cafeteria
D) patient room cleaning supplies
E) therapy pool in the physical therapy department
Answer: C
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The single-factor crosses performed by Mendel support the observation that
A. the two alleles for a given gene are distributed randomly among an individual's gametes. B. the two alleles for a given gene are found within the same gamete. C. if the recessive alleles for two different genes are on the same chromosome, they will never be found within the same gamete. D. only the dominant alleles for a given trait are found in an organism's gametes. E. if the dominant alleles for two different genes are on different chromosomes, they will never be found within the same gamete.
At which stage is the foreign gene introduced into the developing embryo?
a. blastocyst, via a transgenic cell b. egg, via direct microinjection of the new DNA c. sperm, via direct microinjection of the new DNA d. in cell culture, prior to fertilization e. it all depends on the method the particular researcher prefers.
In a parasitic relationship where the host contracts a disease and sometimes dies, the parasite is called:a
a predator. b. a keystone species. c. a mutualistic symbiont. d. an interspecific competitor. e. a pathogen.
The species-productivity hypothesis would predict that there would be more species per unit area in the southwestern United States than in the Amazon rainforest.
Answer the following statement true (T) or false (F)