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What is the source of energy for the synthesis of organic molecules in a photoautotroph?


A) carbon dioxide
B) inorganic compounds
C) other organic compounds
D) light
E) heat

F) All of the above
G) A) and D)

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The disappearance of diatoms from the world's oceans would result in an overall increase in the concentration of atmospheric oxygen.

A) True
B) False

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Members of the Nostoc genus have large numbers of thylakoid membranes,and many have gas vesicles.What statement is also most likely true about Nostoc?


A) They are pathogenic.
B) They form an endosymbiotic mutualism with plant roots.
C) They are photoautotrophs.
D) They are methanogens.
E) They are archaea.

F) A) and E)
G) A) and D)

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Which of the following is NOT a function of mucilage in bacteria?


A) protection against a host's immune system
B) facilitating acquisition of mineral nutrients
C) acting as a flotation device
D) nitrogen fixation
E) holding cells together for communication among them

F) A) and B)
G) B) and E)

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Because they differ from other living organisms by lacking a discrete nucleus and many other cell inclusions,bacteria and archaea are more closely related to one another than they are to eukaryotes.

A) True
B) False

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