Identify the biotic factor of an ecosystem among the following options.
A. Amount of moss available to the consumers
B. Average wind forces that the cliffs withstand daily
C. Amount of nitrogen available for the moss to grow on cliffs
D. Nesting spots on the edge of a cliff that birds can use
Answer: A
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Autoinhibition can reduce enzymatic activity by:
A. reducing the quantity of active enzyme in the cell. B. preventing self-assembly of oligomer. C. requiring a ligand for activity. D. requiring an auxiliary protein for activity. E. All of the choices given are true.
A single, weak contraction of a muscle fiber is called
a. an action potential. b. a muscle twitch. c. fatigue. d. tetanus. e. constriction.
In sweet peas, genes C and P are necessary for
colored flowers. In the absence of either (__ pp or cc __) or both (cc pp), the flowers are white. Give the probable genotype of a plant with colored flowers and a plant with white flowers that produced 38 plants with colored flowers and 42 plants with white flowers. What will be an ideal response?
The dry tissue that no longer carries water and solutes is called ________.
A. Heartwood B. Vascular cambium C. Sapwood D. Bark E. Periderm