Cilia in the trachea move mucus toward the ________.
A. epiglottis
B. brinchioles
Answer: A. epiglottis
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Alternate forms of a gene are called ____
a. homologues b. loci c. alleles d. homozygous e. heterozygous
Increased carbon dioxide concentrations may contribute to
a. ozone depletion. b. global warming. c. eutrophication. d. groundwater contamination. e. biomagnification.
Threatened species
A. are species likely to become endangered in the future. B. are found only in captivity. C. will be extinct within 100 years. D. are rare species that are exploited by humans. E. are currently in danger of extinction throughout all or most of their range.
Which of the following cells is matched to an incorrect function?
A. Neutrophil-important antigen-presenting cell B. Macrophage-phagocytic cell C. Monocyte-precursor of macrophage D. Plasma cells-secrete immunoglobulins E. Natural killer cells-kill virus-infected and tumor cells