Old MacDonald is a rancher and operates a beef feeding lot. To improve the quality of the calfs, he bought a raging bull for the purpose of husbandry. On the spring and during the calfing season, he was surprised that some of the cows suffered of early embryonic death followed by temporary infertility. What is the causative agent of such outbreak?
A. campylobacter fetus subsp. fetus
B. bacillus anthracis
C. campylobacter bovis
D. erysipelothrix rhusiopathiae
E. campylobacter fetus subsp. veneralis
Ans: E. campylobacter fetus subsp. veneralis
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Despite evidence to the contrary, many scientists during the mid-twentieth century remained convinced that ____________________ were the carrier of genetic information
Fill in the blank(s) with correct word
Climate experts predict that in the mountains of western North America
a. average temperatures will rise. b. there will be less snow. c. there will be drier forests. d. there will be more intense wildfires. e. all of these.
Inhalation in humans is achieved by
A) contraction of back muscles. B) relaxation of back muscles. C) relaxation of the diaphragm and muscles between the ribs. D) contraction of the diaphragm and muscles between the ribs.
The close contact between newborns and family members allow them to become ________ with microbes that become established as their microbiota. (Choose the most accurate term.)
A. infected B. parasitized C. colonized D. contaminated E. infiltrated