The layer of a forest in which decomposition takes place and mineral nutrients are released for reuse by plants is called the
A) canopy.
B) understory.
C) herb layer.
D) forest floor.
D
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How do scientists determine the annealing temperature used in PCR reactions?
a. It is always 55?C because the DNA polymerase works best at this temperature. b. It is always 55?C because primers anneal best at lower temperatures. c. It is always 60?C because any other temperature would destabilize the DNA. d. It can vary from 55-60?C depending on the primers being used. e. It can vary from 55-60?C depending on the type of DNA polymerase being used.
Neurons and other cells that produce action
potentials are said to show a. passive transport. b. saltatory conduction. c. excitability. d. capacitance. e. facilitated transport.
Which kingdom would include an organism that is multicellular, relies on other organisms for food, and reproduces by spores?
A) kingdom Animalia B) kingdom Fungi C) kingdom Plantae D) kingdom Protista
Whose work on spontaneous generation first demonstrated the existence of a very heat-resistant form of bacteria that are called endospores?
A. Pasteur B. Redi C. Tyndall D. Schwann