True or False: Helicobacter pylori, when present, is the MOST common single organism found in the stomach
a. TRUE
b. FALSE
Answer: A
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Four of the following statement about protocells are true. Which statement is false?
a. They are simple membrane-bound sacs. b. They contain DNA. c. They are able to engage in metabolism. d. They are able to reproduce. e. They are able to capture energy.
Precarcinogens are themselves not carcinogens but may be activated to become a carcinogen in the liver by the activity of
A) PTEN. B) Ras. C) EGF. D) Cytochrome P450. E) APC.
Snow geese usually select mates of their own color, an example of ____
a. genetic drift b. founder effects c. population bottlenecks d. nonrandom mating e. random mating
What two abiotic factors are considered to most affect organisms?
a. fire and water b. the atmosphere and fire c. temperature and fire d. temperature and water e. climate and fire