When a muscle fiber receives an action potential from a neuron, how many sarcomeres in the fiber contract?
A) The number that contracts is directly proportional to the strength of the action potential.
B) The number that contracts is inversely proportional to the strength of the action potential.
C) Approximately one half of the sarcomeres in the fiber contract.
D) All of the sarcomeres in the fiber contract.
D
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Which of the following features are used to identify chordates?
A. A notochord B. A hollow nerve cord C. A tail during embryonic development D. All of the above are features used to identify chordates.
The nerve impulse moves along the neuron because
A. a current flows along the cell. B. sodium ions flow from one end of the cell to the other. C. there is a high concentration of sodium ions at one end of the cell and a high concentration of potassium ions at the other end of the cell. D. depolarization of one portion of the nerve cell membrane changes the permeability of the adjacent portion of the membrane, allowing it to depolarize as well.
Identify a greenhouse gas that can be produced primarily by microorganisms.
A) oxygen B) propane C) sulfur D) methane
If the chromosomes crossed over equally, the resulting gametes would likely have the same number of genes.
a. true b. false