The earliest fossil records of bacteria-like organisms, dated at over 3 billion years, ________
A) are too spotty to allow us to trace lines of descent to present-day organisms
B) unquestionably belong to cyanobacteria
C) show that early cells had membranes made of short amino acid chains
D) used only RNA molecules for both information storage and chemical catalysis
E) already contained endosymbiotic organelles
A
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Amorphophallus titanum has the largest unbranched inflorescence in the world, reaching over 10 feet in height. One would normally celebrate the existence of such an enormous flower. Regretfully, the scent of the flower has been compared to a “herd of rotting water buffalos.” Which of the following is most likely the pollinator for such a plant?
a. bees b. butterflies c. flies d. birds
Which of the following statements about ecological
succession is false? a. A disturbed area within a community may recover quickly if improved soil remains. b. Pioneer species are the start of community structure. c. The wastes and remains of early colonizers favor the survival of new species. d. Secondary succession occurs on a new volcanic island. e. Later successional species outcompete earlier species.
A ________ plasma membrane allows water but not solutes to pass through it
Fill in the blank(s) with correct word
The elongation of stems is stimulated by
A. auxin only. B. gibberellin only. C. ethylene only. D. auxin and gibberellin. E. auxin and ethylene.