The process whereby oxygen is depleted by the growth of microorganisms due to excess nutrients in aquatic systems is called ________.
Fill in the blank(s) with the appropriate word(s).
eutrophication
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The two major categories of extracellular signal molecules that bind to cell surface receptors are ____
a. peptide hormones and steroid hormones b. steroid hormones and neurotransmitters c. neurotransmitters and vitamins d. growth hormones and vitamins e. peptide hormones and neurotransmitters
Which of the following is NOT involved in
nitrogen fixation? a. breaking triple bonds b. production of ammonia c. production of NO3 ? d. production of NH4 + e. All of these are involved in nitrogen fixation
The secretion of TSH by the anterior pituitary gland stimulates the thymus to secrete thymosin.
a. true b. false
Answer the following questions true (T) or false (F)
1. Observation of a natural event by more than one human or scientific instrument is the basis of the scientific method. 2. The experiments of Louis Pasteur to disprove spontaneous generation illustrate the process of the scientific method. 3. A theory must be supported by evidence.