Which of the following is true concerning environmental influence on genetic expression?
A) The only time a gene can be influenced by environmental factors is in the second trimester of pregnancy.
B) Drugs and nutrition can alter normal gene expression.
C) It is impossible to alter in any way the expression of a gene in humans.
D) Environmental factors determine the way in which 90 percent of our genes are expressed.
B
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A hormone that helps to regulate the sodium ion content of the body is
A) cortisol. B) parathormone. C) thymosin. D) somatotropin. E) aldosterone.
Simple squamous epithelium would be found
A) at the surface of the skin. B) lining the trachea. C) lining blood vessels. D) lining the stomach and small intestine. E) lining the urinary bladder.
The ________ foramina are exclusive to the cervical vertebra.
Fill in the blank(s) with the appropriate word(s).
You would normally expect to find ____________________ in the urinary bladder.
A) simple squamous epithelium B) simple cuboidal epithelium C) stratified squamous epithelium D) transitional epithelium E) simple columnar epithelium