The analysis of only one STR is needed to obtain a DNA profile that is statistically unique to a given individual
a. True
b. False
False
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Gram-positive bacteria have __________ and appear
__________ under the microscope. a. thick walls; pink b. thick walls; purple c. thin walls; pink d. thin walls; purple e. none of these
In eukaryotic cells, which of the following genetic elements can prevent the increase in gene expression that results from the presence of an enhancer sequence?
A) repressor B) silencer C) cofactor D) insulator E) sigma factor
U.S. health officials are considering different ways of preparing for a future worldwide epidemic of human influenza that could be derived from a form of the disease that infects birds (avian flu)
Which actions would be useful in preventing a future influenza epidemic? A) Inject helper T cells into healthy people to boost immune systems. B) Inoculate infected people with a vaccine against the pathogen. C) Give antibiotics to people with mild symptoms. D) Ask people with flu symptoms to stay at home.
Altogether, the body secretes about 7 liters of water into the alimentary canal each day. About what percentage of this water gets reabsorbed?
A) 30% B) 50% C) 75% D) 90%