Animal cells recognize common types of pathogen molecules and activate the production of antimicrobial peptides. Indicate whether the statement is true or false
True
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Conifer resin has what properties?
_____ It hardens on contact with air. _____ It flows through ducts in the wood and leaves. _____ It forms amber, often trapping insects and other organisms. _____ It attracts insects and other organisms that facilitate reproduction. _____ It can prevent attack by herbivores and pathogens.
Choose the correct order of tracheal system structures from most external to most internal
a. spiracles, tracheae, tracheal branches, tracheoles b. tracheoles, tracheae, tracheal branches, spiracles c. tracheoles, tracheal branches, tracheae, spiracles d. spiracles, tracheal branches, tracheae, tracheoles
e. spiracles, tracheoles, tracheae, tracheal branchesIn the figure above, the HIV that infected more than 400 children in a Benghazi hospital:
a. is closely related to strains from Cameroon and Ghana. b. suggests that West Africa was a likely source of the strain that seeded the outbreak. c. suggests a single introduction was responsible for the outbreak in Benghazi. d. All of the above. e. A and C.
The main effect of burning peat, wood, coal, and petroleum on the Earth's climate is
A. the fires release back into the atmosphere carbon dioxide that was once taken from the atmosphere by plants and stored in their own tissues; the increased carbon dioxide holds in solar heat and causes a rise in temperature. B. the rising heat from fires produces wind that cools the surface of the Earth. C. the fires significantly heat the air and cause a rise in global temperature. D. the smoke blocks sunlight from reaching the Earth and causes a significant lowering of the Earth's temperature. E. the fires use up oxygen that would otherwise block penetration of ultraviolet light from reaching the Earth; the increased ultraviolet radiation heats the Earth.