Which of the following statements regarding Clostridium difficile infection is incorrect?
A. It is the major cause of diarrhea in hospitals.
B. It is a colitis that is a superinfection.
C. It is associated with disruption of normal biota due to broad-spectrum antimicrobials.
D. It is due to ingestion of contaminated, improperly stored, cooked meats and gravies.
Answer: D
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The pollen grain is:
A. the male gametophyte. B. the female gametophyte. C. the male sporophyte. D. the female sporophyte.
Methane is an important greenhouse gas whose levels in the atmosphere are also rising. This is because:
A. methane is generated by archaeons living in the guts of cattle, and beef production is increasing. B. methane is generated by archaeons living in waterlogged rice paddies, and rice production is increasing. C. methane is released when permafrost at high latitudes melts, and more permafrost is melting. D. methane is generated by archaeons living in the guts of cattle and in rice paddies, and both beef and rice production are increasing. E. All of the above.
Meiosis _____ the parental chromosome number
a. doubles b. halves c. maintains d. mixes up e. quadrupils
Which of the following statements about parasitic helminths is incorrect?
A. They are multicellular animals. B. They have a definitive host in which the adult form lives. C. They include roundworms and tapeworms. D. They have larval forms that do not affect humans.