A gene can best be defined as ________
A) a segment of DNA that carries the instructions for one polypeptide chain
B) a three-base triplet that specifies a particular amino acid
C) noncoding segments of DNA up to 100,000 nucleotides long
D) an RNA messenger that codes for a particular polypeptide
A
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What evidence lends support to the hypothesis that in a species, males generally have lower immunotolerance than females?
A) Males die younger. B) When males are treated with testosterone implants, a decrease in immunotolerance is observed. C) When males are treated with cholesterol implants, an increase in immunotolerance is observed. D) The slower the maturity rate, the lower the immunotolerance.
Merocrine glands produce their secretions by accumulating their secretions internally until the cell ruptures
Indicate whether the statement is true or false
In the figure showing an anterior view of the arteries, which number indicates the left internal carotid artery?
A. 1 B. 2 C. 3 D. 4 E. 5
Microscopic folds that extend from the apical surface of certain epithelia to increase the surface area for absorption and secretion are called
A. microvilli. B. mucus. C. flagella. D. desmosomes. E. cilia.