Tuberculosis is typically transmitted via which of the following?
A) air
B) food
C) sexual activity
D) water
Ans: A) air
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A nosocomial infection is one that:
A) a patient develops during hospitalization or erupts within 14 days of hospital discharge. B) affects only the nose. C) is acquired in the community. D) the patient has at the time of hospital admission.
A restriction fragment is generated by the action of a restriction enzyme (endonuclease)
Indicate whether the statement is true or false
Answer the following questions in reference to the four geologic periods listed below.
A. Asteroid impact at the K-T boundary caused extinctions. B. Human practices are the major agents of extinction. C. D. Volcanic activity in what is now Siberia released a large amount of carbon into the atmosphere causing extinctions. E. Oceans became anoxic, and methane burned on land. F. The greatest mass extinction event where 90 to 95 percent of all species were lost
How would you best explain the correlation between an increase in Hox genes and an increase in animal body complexity?
A. Different Hox genes are expressed in different regions of the body. B. An increase in the number of Hox genes meant that fewer regulatory genes could be controlled in a species. C. As the number of Hox genes increases, the number of genes encoding proteins for appendage development decreases D. Hox genes have duplicated several times during animal evolution, but they are not responsible for an increase in body plan complexity. E. An increase in the number of Hox genes allows for greater specialization in different body regions.