Which of the following is most descriptive of
an electron transport chain?
a. It generates energy from nothing.
b. It is a mechanism used by cells to dispose
of unused electrons.
c. It transfers electron energy, stepwise, from
one compound to another.
d. It transfers energy, stepwise, from one
compound to another.
e. It requires activation by sunlight.
D
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Which one of the following statements about carbon is correct?
A. Each of carbon's three valence electrons shares a bond with another atom. B. Carbon-carbon single bonds allow for free rotation around the bond; carbon=carbon double bonds do not allow for free rotation around the bond. C. The spacial orientation of carbon's bonds results in carbon resting in the center of a three-dimensional structure referred to as a hexahedron. D. Carbon is not only the most abundant element on Earth; it is believed to be the most abundant element in the universe. E. Single bonds between carbon atoms are typically shorter than double bonds between carbon atoms.
Boiling will not inactivate Giardia lamblia cysts in contaminated water.
Answer the following statement true (T) or false (F)
An organism that uses CO2 for its carbon needs and sunlight for its energy needs would be called a ________.
A. halotroph B. saprobe C. heterotroph D. photoautotroph E. chemoheterotroph
Cell theory was first proposed in 1838. Evidence obtained through additional scientific investigations resulted in the current cell theory. Which statement describes a component of the original cell theory that was removed because of the new scientific knowledge?
A. All living things are made of cells. B. All cells come from other preexisting cells. C. Cells form through spontaneous generation. D. Cells are the basic structural and functional units of life.