In a freshwater environment, what is the function of the structure on Figure 48-2 labeled A?
a. salt uptake
b. water gain by osmosis
c. drinking
d. removal of salts and nitrogenous wastes from the blood
e. release of nitrogenous wastes
A
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If a population of diploid organisms has three different alleles for a particular gene, how many different genotypes are possible?
A. 2 B. 3 C. 6 D. 9 E. 12
HIV infection and the subsequent destruction of which cell type is most devastating to overall immune system function?
A. cytotoxic T cells B. memory B cells C. helper T cells D. monocytes E. natural killer cells
Which is the correct order of blood vessels in the systemic circulation, beginning when the blood leaves the heart?
1.Arteriole, artery, capillary, venule, vein 2.Artery, arteriole, capillary, venule, vein 3.Vein, venule, capillary, arteriole, artery 4.Vein, venule, arteriole, capillary, artery
The frequency of heterozygotes for cystic fibrosis shows ethnic variations. Indicate whether the statement is true or false