When bird populations migrate and mix with populations that do not migrate, ________ will occur.
A. gene flow
B. gene blending
C. genetic drift
D. mutation
Answer: A
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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.
Overproduction of what substance is associated with biofilm production and mucoid phenotype of P. aeruginosa isolates found in cystic fibrosis patients?
a. Alginate b. Exoenzyme T c. Phospholipase C d. Pyocyanin
The ____ digestive structures in humans secrete amylase
a. liver and gallbladder b. liver and pancreas c. pancreas and gallbladder d. pancreas and salivary glands e. pancreas, liver, and salivary glands
Transcription is a process that occurs in cells. Which is the best description of transcription?
A) A DNA template is used to generate RNA. B) A DNA sequence is used to activate enzymes in a cell. C) DNA is copied. D) A RNA template is used to make proteins.