Which of the Following Is Correct

question 8

Multiple Choice

Which of the following is correct?

• A)Nitrogen is an important element in amino acids,proteins,and cholesterol.
• B)Plants lacking a symbiotic nitrogen-fixing partner must rely on nitrogen compounds in the soil.
• C)Most commercial fertilizers contain nodules with nitrogen-fixing bacteria.
• D)A positive effect of nitrogen fertilizer application is that it can cause huge population increases of algae called "algal blooms."
• E)Humans have had little impact on the nitrogen cycle,even with the burning of fossil fuels.

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Definitions:

Synaptic Knob

The end of the axon branch.

Impulse Transmission

The process by which nerve signals are passed along neurons through the release and reception of neurotransmitters across synapses.

Neurotransmitters

Chemical substances that transmit signals across a synapse from one neuron to another in the nervous system.

Sciatic Nerve

The largest nerve in the human body, running from the lower back down through the buttock and into the lower limb, responsible for sensation and movement in the leg.