The use of metals as terminal electron acceptors is/are known as ________ because the metals are not incorporated into biomass.
A. Fenton reactions
B. dissimilatory metal reduction
C. metallo-neutral
D. negative metallic addition
Answer: B
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Of the following, which one is not found in procaryotic cells?
A) cell membrane B) chromosome C) mitochondria D) plasmids
It is accurate to say that neural transmission across nearly all mammalian synaptic clefts is the result of
A. neural impulses involving the flow of K+ and Na+ across the cleft. B. neural impulses traveling across the gap as electrical currents. C. neural impulses causing the release of chemicals that diffuse across the cleft. D. neural impulses traveling across the cleft in both directions. E. the calcium within the axons and dendrites of nerves adjacent to a synapse acting as the neurotransmitter.
What is the current rate of species extinction?
a. 500xs faster than normal b. 20xs faster than normal c. 100xs faster than normal d. 10xs faster than normal e. 1000xs faster than normal
Which of the following is a purine base found in nucleotides?
a. uricil b. steroid c. guanine d. cytosine e. thymine