Dissimılatory nitrate reduction carried out by bacteria can lead to loss of nitrogen as N2 from the environment. A) O True B) O False

Which of the following is correct about biofilms? O 1) They are comprised only of psychrophiles. O 2) They are more sensitive to changes in growth conditions than planktonic cells O 3) Quorum sensing allows the biofilm community to behave differently than planktonic organisms 4) Biofilms only form within the environment. 5) Pure cultures are necessary for biofilm formation.

Which of the following formulas are correct regarding productivity? (recall; GPP gross primary production, NPP = net primary production, & R = respiration) Mark only one oval. OA) GPP+R=NPP OB) GPP-R=NPP C) NPP-GPP=R D) NPP-R=GPP Plants assimilate energy through the process of which? Mark only one oval. A) decomposition. B) respiration. C) photosynthesis. V D) regeneration. Net primary productivity in an ecosystem increases as mean annual temperature... Mark only one oval. OA) and mean annual rainfall decrease. B) decreases and mean annual rainfall increases. C) increases and mean annual rainfall decreases. D) and mean annual rainfall increases. G

Which of the following is a nitrogenous waste product that is rarely the final product eliminated by animals inhabiting dry environments? A) Urea B) Nitric acid C) Nitrate D) Ammonia E) Uric Acid