This atom in its unbound state has four valence electrons. These electrons readily form single, double, and even triple bonds among themselves to become stable. This atom is:
A. carbon.
B. hydrogen.
C. oxygen.
D. nitrogen.
E. phosphorus.
A
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All unicellular organisms belong to the same domain of life
Indicate whether the statement is true or false.
Species interactions between members of a community include __________, which harms both species. Fill in the blank(s) with the appropriate word(s)
During aerobic respiration, electrons travel downhill in which sequence?
A) glucose ? NADH ? electron transport chain ? oxygen B) glucose ? pyruvate ? ATP ? oxygen C) glucose ? ATP ? electron transport chain ? NADH D) food ? glycolysis ? citric acid cycle ? NADH ? ATP
Which of the following would NOT be evidence that mitochondria were once prokaryotic?
a. similarities of mitochondrial ribosomes and bacterial ribosomes a. similarities of mitochondrial ribosomes and bacterial ribosomes b. negative effects of antibiotics on mitochondria c. DNA similarities of mitochondria and free-living bacteria d. the presence of a circular chromosome e. presence of a nucleus within mitochondria