The gametophyte is the dominant stage in the life cycle for which of the following plant groups?
a. club mosses
b. whisk ferns
c. liverworts
d. horsetails
e. ferns
c
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The original impetus to sequence the human genome was to investigate
A) how the four nitrogenous bases encode information. B) how people vary. C) how cancer arises. D) the effects of exposure to low-level radiation on the genetics of populations.
A pathogen is
a. a disease. b. an organism that causes a disease. c. a substance that kills bacteria. d. the same as a heterocyst.
The phenomenon of microbial antagonism can be explained by
a. certain normal biota directly kill other species by phagocytosis b. normal biota members change the chemical environment making it hostile to other species c. the immune system only recognizes certain species for destruction d. there is limited space for occupation in or on certain areas of the human body
Examined cancer cells from the lungs of smokers demonstrate which of the following?
A) mutation rates that are similar to those in a smoker's heart B) normal mutation rates compared to non-smokers C) unregulated methylation patterns D) the occurrence of tumor-suppressor mutations is less in the lung than the throat