A gene is best defined as _________________.
a) A segment of a chromosome that allows for DNA replication.
b) a segment of DNA that carries instructions for the production of one polypeptide chain.
c) A segment of a protein that directs the production of RNA.
d) A segment of DNA that carries instructions for the product of a lipid.
b) a segment of DNA that carries instructions for the production of one polypeptide chain.
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The functional unit of the kidney is the __________.
Fill in the blank(s) with the appropriate word(s).
The prostate gland
a. secretes prostaglandins. b. supplies fructose, which is utilized by the sperm for energy production. c. secretes an alkaline medium that is important to neutralize acidic vaginal secretions. d. both (a) and (c) above. e. all of these answers.
Iron
A. prevents carbon monoxide from binding to hemoglobin. B. is a plasma coagulation factor. C. is the binding site for carbon dioxide on the hemoglobin molecule. D. is needed to produce hemoglobin. E. interferes with the normal function of hemoglobin.
What explains the dramatic acceleration in lengthwise bone growth at puberty?
A. Increased rate of calcium deposition occurs due to high blood calcium levels. B. Increased physical activity causes lengthwise growth in response to bone stress. C. Increased secretion of sex hormones promotes epiphyseal plate growth. D. Increased activity of osteoclasts occurs in response to parathyroid hormone stimulation. E. Increased absorption of dietary vitamins and minerals strengthens the matrix.