Matter and energy flow through the biosphere. The flow of matter, however, differs from the flow of energy. Which of the following statements accurately describes these differences?
A) Matter flows in cycles, whereas energy flows in one direction.
B) Matter does not accompany energy as it enters the biosphere, but it does flow with energy from the biosphere.
C) Energy flows from chemotrophs to phototrophs, whereas matter flows from phototrophs to chemotrophs.
D) Energy flows as organic molecules are reduced to inorganic molecules, but matter does not.
E) Matter and energy flow sometimes in cycles and sometimes unidirectionally.
A) Matter flows in cycles, whereas energy flows in one direction.
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Which of the following structures help to increase the surface area for nutrient absorption in the small intestines?
A. villi and microvilli B. villi C. microvilli D. tight junctions E. villi, microvilli, and tight junctions
One major difference between metaphase I and metaphase II is the presence or absence of bivalents.
Answer the following statement true (T) or false (F)
Which molecular method probes several genes or transcripts simultaneously?
a. ARISA b. DGGE c. microarrays d. T-RFLP
When the end product of a pathway inhibits catalysis of the first step of that pathway, this phenomenon is called ________.
A. feedback inhibition B. reversible covalent modification C. noncompetitive inhibition D. metabolic channeling