The force that moves water through xylem is provided by:
A) transpiration. B) active transport. C) osmosis. D) gravity.
Answer: A
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The axial skeleton includes all EXCEPT which
of the following? a. skull b. ribs c. pectoral girdle d. sternum e. vertebral column
Proton pumps are used in various ways by members of every domain of organisms: Bacteria, Archaea, and Eukarya. What does this most probably mean?
A) Proton gradients across a membrane were used by cells that were the common ancestor of all three domains of life. B) The high concentration of protons in the ancient atmosphere must have necessitated a pump mechanism. C) Cells of each domain evolved proton pumps independently when oceans became more acidic. D) Proton pumps are necessary to all cell membranes.
Answer the following questions true (T) or false (F)
1. Mycoplasmas are named for the large quantities of mycolic acid in their cell walls. 2. Most of the methane produced by methanogens is oxidized by other types of bacteria before it affects Earth's climate. 3. Bacteria in the genus Cytophaga are capable of digesting a wide range of complex carbohydrates and are important for degrading raw sewage.
In a cross-cultural study looking at mate preferences, David Buss (1989) found that both males and females consistently rated ________ as the most important attribute in a mate.
a) Physical attractiveness b) Attention to detail c) Resource holding potential d) None of the above