Which of the following statements contrasting simple versus complex multicellularity is true?
A. Complex multicellular organisms show a
large degree of cellular differentiation,
whereas simple multicellular organisms show
little differentiation of specialized cell types.
B. Cell or tissue loss in a simple multicellular
organism can be lethal for the entire
organism, whereas cell or tissue loss in a
complex multicellular organism does not lead
to death of the entire organism.
C. Highly specialized molecular mechanisms
allow for adhesion between cells in simple
multicellular organisms, but not in complex
multicellular organisms.
D. Only some cells are in direct contact with
the environment in simple multicellular
organisms, whereas all cells are in direct
contact with the environment in complex
multicellular organisms.
E. Most or all of the cells in a complex
multicellular organism are capable of
reproduction, whereas only a subset of cells
contributes to reproduction in simple
multicellular organisms.
A
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In a trophic pyramid, the biomass of lower trophic levels is typically much greater compared to that of higher levels. What does this tell you about the transfer of energy between trophic levels? Select all that apply
A. Energy does not move from lower to higher trophic levels. B. Energy is gained as it moves from lower to higher trophic levels. C. Energy is lost as it moves from lower to higher trophic levels. D. The amount of energy remains the same as it moves between trophic levels.
Specific immunity in the extracellular fluid is provide by mainly
A. IgG and IgM B. IgM and IgD C. IgA and IgE D. IgD and IgA E. IgE and IgG
Which of the following statements is false?
a. Endotherms have a higher metabolic rate than ectotherms. b. Endotherms can regulate their temperature through behavior. c. Ectotherms regulate their temperatures through behavior. d. Heterotherms may function as either an ectotherm or an endotherm. e. Ectotherms do better in cold climates.
What is the first step during transcription initiation in prokaryotes?
A. RNA polymerase binds to the promoter. B. The transcription bubble is formed. C. Transcription factors bind to the TATA box sequence. D. The DNA double helix is unwound. E. RNA polymerase synthesizes a short primer.