Which of the following is the most accurate and comprehensive description of the function of kidneys?
a. the breakdown of body wastes
b. the excretion of wastes
c. the regulation of body fluid composition
d. filtration of the blood
e. production of urine
Ans: c. the regulation of body fluid composition
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Why is cancer described as a disease of altered gene expression?
a. Gene expression controls lipid raft formation. When lipid rafts fail, cell to cell communication can break down, resulting in cancer. b. Mutated genes can trigger demyelination of the nerve cells, causing breakdown of nerve signal transmission and resulting in tumor formation. c. Mutated genes can result in proteins that behave erratically or fail to function. If they function in cell cycle control, the result can be out of control, cancerous growth. d. This statement is mostly untrue as gene expression has very little control over the development of cancer.
Various forms of the same gene are called
a. genotypes. b. alleles. c. somatic. d. recessive. e. phenotypes
When the nerve impulse reaches the end of the axon, it stimulates the release of a chemical that stimulates depolarization of the next neuron in the chain. This chemical is
A. acetylcholine. B. acetylcholinesterase. C. thyroxine. D. estrogen.
Saliva contains salivary __________ an enzyme that begins the chemical digestion of starch.
Fill in the blank(s) with the appropriate word(s).