When using ________ as a terminal electron acceptor, Thiobacillus can sequentially reduce nitrate to nitrogen gas in a process called ________. Certain Thiobacillus species can also chemolithotrophically use ________ as an electron donor.
What will be an ideal response?
nitrate, denitrification, ferrous iron
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The most serious consequence to humans of a decrease in global biodiversity would be the _____
A) increase in global warming and thinning of the ozone layer B) potential loss of ecosystem services on which people depend C) increase in the abundance and diversity of edge-adapted species D) loss of source of genetic diversity to preserve endangered species E) loss of species for use as crops.
In a cell membrane, the phospholipid heads are ____
a. hydrophobic b. nonpolar c. dissolved in the cell’s watery interior d. sandwiched between the phospholipid tails e. formed by fatty acids
Action potentials traveling down the plasma
membrane of a muscle fiber will next reach the a. plasma membrane. b. sarcoplasmic reticulum. c. cytoskeletal system. d. T tubules. e. endomembrane system
Which organ system acts upon substances contained in the alimentary canal?
A) circulatory system B) digestive system C) integumentary system D) excretory system