How do the hormones involved in blood calcium homeostasis actually function?
A) Parathyroid hormone stimulates calcium deposit in bones and increases calcium uptake in the kidneys.
B) A falling blood calcium level causes the thyroid to release calcitonin.
C) Calcitonin acts to lower blood calcium levels, and parathyroid hormone acts to raise blood calcium.
D) Both parathyroid hormone and calcitonin act to raise blood calcium levels.
C
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Many types of bacteria are only ________ when dispersing from more stable and heterogeneous communities known as biofilms.
Fill in the blank(s) with the appropriate word(s).
The shortage of the neurotransmitter that
causes Parkinson’s disease occurs in the region of the brain that controls
a. memory. b. motor function. c. comprehension. d. sensory perception. e. hearing.
Genetic variation associated with meiosis is manifested as
a. new combinations of alleles due to crossing over. b. random movement of homologous pairs of chromosomes moving to spindle poles. c. random chance playing a role when a sperm fertilizes an egg. d. diploid cells expressing various traits. e. a, b, and c.
Most elements in nature exist as:
A. mixtures of liquids B. mixtures of gases C. mixtures of different isotopes D. solitary unreactive atoms