DNA polymerase can only elongate a piece of DNA or RNA
a. true
b. false
Ans: a. true
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The most common cause of low sperm count in males is _____
a. varicocele b. undescended testicles
c. testicular failure d. semen disorders e. obstructions
Which organisms stain as either Gram-positive or Gram-negative?
a. Bacteria b. Mercaria c. Archaea d. Eukarya
Alexander Oparin and John Haldane postulated that the early atmosphere was a reducing atmosphere. Why was this prediction an important one?
a. because the molecules contain the maximum possible number of protons that can be easily donated in reactions that lead to synthesis of complex molecules b. because the molecules contain the minimum possible number of electrons that can be easily donated in reactions that lead to synthesis of complex molecules c. because the molecules contain the maximum possible number of protons that can be easily accepted in reactions that lead to synthesis of complex molecules d. because the molecules contain the maximum possible number of electrons that can be easily donated in reactions that lead to synthesis of complex molecule
Of the ________ electrons released in Nitrosomonas europaea nitrification, ________ must return to AMO to continue ammonia oxidation, while ________ can be used either as reductants for biosynthesis or be donated to the electron transport chain to reduce the terminal electron acceptor, oxygen.
Fill in the blank(s) with the appropriate word(s).