The human body has about 10 bacterial cells for every eukaryotic cell. Bacteria coat our skin, gut, and mouth. Also present are protists, Archaeans, and viruses. Collectively, these organisms are our microbiota
For most members of our microbiota, our body provides their environment (or space to live).
They, in turn, have no effect on us. This is an example of _______________.
A. mutualism
B. an antagonistic relationship
C. commensalism
D. predation
C
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Which theory explains how hydrogen bonding allows water molecules to maintain a continuous fluid column as water is pulled from roots to leaves?
a. pressure flow b. evaporation c. cohesion-tension d. abscission e. fusion
The first land plants were bryophytes, which then branched into ferns, gymnosperms, and finally angiosperms. What advantage did angiosperms have over gymnosperms?
a. Angiosperms can produce flowers and fruits to aid in seed dispersal b. Angiosperms produce pollen and do not require water to reproduce c. Angiosperms go through alternation of generations d. Angiosperms have a vascular system, this allowed them to grow taller e. The angiosperms can produce spores which are more stable than seeds from gymnosperms
What major adaptations contributed to the success of the angiosperms?
A) Broad leaves B) Flowers and fruits C) Sap containing "antifreeze" D) A and B E) A and C
Reproductive isolating mechanisms
a. occur within a species. b. can prevent members of the same species from reproducing. c. only act after fertilization. d. can prevent members of different species from interbreeding. e. only act before fertilization.