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Old Chapter - biology notes


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What sets your Basal Metabolic Rate?
Where is thyroxine produced?
in your thyroid gland
What are neurotransmitters?
chemicals that allow an electrical message to be transmitted from one neuron to the next, or from from a neuron to a muscle/gland.
What is melanin?
A chemical that causes pigments in your skin, hair, etc.
How much energy is required to break N2 triple bonds?
940 kJ/mole
What can bacteria use to break the bonds of N2 much easier?
the enzyme nitrogenase
Where is rhizobium frequently found?
on nodules of legumes (peas, clover, alfalfa, soybeans, beans)
What does the suffix -ase USUALLY mean?
that it's an enzyme
If a catalyst is in a living thing, what is it called?
an enzyme
What kind of catalyst is an enzyme?
a biological catalyst
Why is crop rotation useful?
It keeps the soil from becoming depleted (stripped of its nutrients). You will not have to use as much fertilizer (which is expensive).
Which type of fertilizer is cheaper... ammonia or nitrate?
Which type of fertilizer is better for helping plants grow?
All plants and animals can reduce NH4+ to what?

Can some1 confirm that all animals can do this? it think it's only plants and bacteria.

animals can't do anything with NH4+, remember it kills us
nitrate (NO3-)
~no please drink ammonia, see what happens
What is crop rotation?
planting different crops on the soil each year

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