_________ isolated from _________ is used for the creation of a cDNA expression library.
a) Telomerase: Vibrio cholera
b) EcoRI endonuclease: E. coli
c) Reverse transcriptase: retrovirus
d) DNA Polymerase: Thermus aquaticus
Answer: c) Reverse transcriptase: retrovirus
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Antimicrobial susceptibility testing should be performed when:
a. a single bacterial species grows from any body site. b. an isolate has a predictable susceptibility profile to therapeutic drugs of choice. c. reliable standardized methods for testing a clinically significant isolate exist. d. administering intravenous or oral antibio-tics to treat an infection.
An increased number of patients have recently been diagnosed with celiac disease, which you may know of as gluten sensitivity (OMIM 212750)
It is a multifactorial disorder of the small intestine influenced by genes and environment, and it is characterized by malabsorption due to inflammation of the mucosa after eating wheat gluten or related proteins. It is now thought to occur in 1 out of 120 to 300 people. Genes found to be associated with it are in the HLA region of chromosome 6, namely DR3 and DQw2. Which of the following is more probable? A) It is an autoimmune disorder. B) It is caused by exposure to gluten in infancy. C) It has high broad-sense heritability. D) Its frequency varies greatly by population. E) It is found primarily in inbred populations.
A person using a very effective sunscreen would be less likely to make which vitamin within his or her body?
A) vitamin A B) vitamin B C) vitamin C D) vitamin D
Polychaetes crawl by means of leg-like ________ which also serve in respiration.
a. Aortic arches b. Metanephridia c. Clitella d. Palps e. Parapodia