Bogs formed when a lake basin fills in from above rather than from below, creating a floating mat of peat over open water, are called
A) fens.
B) blanket mires.
C) moors.
D) quaking bogs.
D
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When tryptophan levels in a cell are low, a cell will stall transcription but continue translation of the tryptophan operon.
Answer the following statement true (T) or false (F)
Which of the following methods is the most effective as birth control?
a. condoms b. diaphragms c. abstinence d. oral contraceptives e. vasectomy
If you were observing a newly discovered animal and wanted to determine if it reproduces sexually or asexually, you could
A. perform genetic screening on the parents and offspring to see if the offspring are genetically identical to parents. B. examine males to see if sperm can be produced. C. try to observe mating behavior. D. look carefully for nests with eggs. E. None of the answer choices is correct.
What substance required for aerobic metabolism is supplied to the body cells by respiration?
A. Oxygen B. Carbon dioxide C. Hemoglobin D. Nitrogen E. Glucose