In an annual tree ring, the wood with large diameter, thin-walled cells is ____
a. called early wood
b. heartwood
c. formed from crushed phloem cells
d. produced in the winter
e. called late wood
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Which of the following comparisons between the moss life cycle and fern life cycle is NOT valid?
A. Both kinds of plants have flagellated sperm that need water to reach the female gamete. B. The sporophyte generation is much larger than the gametophyte generation in ferns but is smaller than the gametophyte generation in mosses. C. The spores are produced in capsules on stalks in mosses but in small structure called sori on the underside of leaves in ferns. D. Both kinds of plants depend on wind for dispersal of spores. E. The gametes are produced in gametangia in mosses but on the underside of leaves in ferns.
Amebiasis
A. is caused by . B. often causes a bloody diarrhea. C. is an infection of the stomach. D. is restricted to temperate climates. E. is caused by AND often causes a bloody diarrhea.
These white blood cells are in interstitial fluid,
phagocytize almost everything except uninjured body cells, and secrete cytokine which alerts the adaptive immune system to threats. These white blood cells are
a. neutrophils. b. macrophages. c. T lymphocytes. d. dendritic cells. e. eosinophils
Which of the following pairs correctly matches the monomer with its polymer?
A) peptides; proteins B) amino acids; polysaccharides C) glucose; proteins D) terpenes; nucleic acids E) nucleotides; nucleic acids