PEA stands for Phenylethyl Alcohol Agar medium. It is a selective solid medium that is used to culture Gram Positive bacteria. In this medium, phenylethyl alcohol is an active ingredient that inhibits the growth of Gram Negative bacteria. It causes leakage in the cell membrane of Gram Negative bacteria. It is also used for the growth of obligate anaerobic bacteria.
Answer:
The correct order would be
Sensory receptors in the arteries detect low oxygen levels.
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Sensory neurons generate an impulse.
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The central nervous system relays an impulse to certain brain regions.
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The brain sends signals through motor neurons.
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Isabel's breathing rate increases.
The working of the nervous system can be summarized as:
The receptors receives the stimulus which then send signals to the brain with the help of sensory neurons.
For example, sensory receptors in the arteries detect the low oxygen levels after which sensory neurons send the signals to the brain.
The stimulus or information is processed in a specified region of the brain which then sends the signals to the effector organ via motor neurons.
The action or reaction is generated at the effector site such as an increase in the breathing rate of Isabel in this case.
Letter B, shows the amount of energy within each trophic level.
Enzymes only work on their specific substrates because enzyme catalysis involves enzyme and substrate binding to form an enzyme substrate complex.
In other words, the of substrate substances an enzyme can bind to leading to the specificity of enzyme activity aids in causing the correct reaction in the particular structure.
The best and most correct answer among the choices provided by the question is the second choice. The statement "<span>Organisms living today do not share ancestry with older, simpler life-forms." is False. </span>I hope my answer has come to your help. God bless and have a nice day ahead!
