The broad base at the primary producer level in a trophic pyramid is due to all of the following except:
A. the greatest availability of energy.
B. the greatest amount of biomass.
C. the relatively higher number of primary
producers compared with organisms at other
levels.
D. the amount of oxygen given off at this
level.
E. the larger body size of primary producers
compared with organisms at other levels.
E
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Which of the following characteristics are unique to eukaryotes (i.e., do not occur in either archaea or bacteria)? (Select all correct choices.)
A. the presence of introns in most genes (non -coding stretches of DNA) B. the presence of exons in most genes (coding stretches of DNA) C. the presence of chlorophyll D. the presence of nuclei
Which of the following would you expect to find in the tonsilar crypts?
A. Streptococcus B. Staphylococcus C. Neisseria D. Micrococcus
Answer the following statements true (T) or false (F)
1. All sugars are absorbed via secondary active transport. 2. In omnivores, including humans, the cecum is an important organ for digestion of cellulose. 3. Fat absorbed by the small intestine enters the lymphatic system. 4. Frugivores are a type of herbivore.
A plant cell with a ?P ? 0.2 MPa maintains a constant volume when bathed in a solution that has a ?S ???0.2 MPa
and is in an open container. What do you know about the cell?
a. The cell has a ?S ? 0.4 MPa. b. The cell has a ?S ???0.2 MPa. c. The cell has a ?S ???0.4 MPa. d. The cell has a?????0.4 MPa. e. The cell has a??? 0.2 MPa