Unsanitary and crowded conditions increase the incidence of all of the following diseases EXCEPT
A) plague.
B) epidemic typhus.
C) endemic murine typhus.
D) Rocky Mountain spotted fever.
E) relapsing fever.
D
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The difference between thermal death time and thermal death point in microbicidal activity is that
A. thermal death time is the shortest amount of time required to kill an organism at a 100oC, whereas thermal death temperature is the lowest temperature required to kill an organism in 10 minutes. B. thermal death time is the greatest amount of time required to kill an organism at a specific temperature, whereas thermal death temperature is the lowest temperature required to kill an organism in 10 minutes. C. thermal death time is the shortest amount of time required to kill an organism at a specific temperature, whereas thermal death temperature is the lowest temperature required to kill an organism in 10 minutes. D. thermal death time is the shortest amount of time required to kill an organism at a specific temperature, whereas thermal death temperature is the lowest temperature required to kill an organism in 30 minutes.
The phrase "one gene-one enzyme" is associated with the work of
A. Lederberg. B. Watson and Crick. C. Beadle and Tatum. D. Mendel.
Identify the correct steps and the correct order for cloning a gene of interest
1. Transform the bacteria. 2. Mix the postrestriction endonuclease gene of interest with the postrestriction endonuclease cloning plasmid. 3. Incubate the combined DNA fragments with the liagase enzyme. 4. Use restriction endonucleases to cut the gene of interest and the target DNA. 5. Spread bacteria on medium containing lactose and ampicillin. 6. Spread bacteria on medium containing X-gal and ampicillin.
a. 4, 2, 3, 1, 6 b. 4, 3, 2, 1, 5 c. 4, 3, 2, 1, 6 d. 4, 2, 3, 1, 5 e. 2, 4, 1, 5, 3
Bt transgenic crops are designed to ________
A) improve the nutritional value of crops B) make crops heat-resistant C) make crops cold-resistant D) increase vitamin B content E) provide resistance to insects