Which of the following is not true regarding the history of life on Earth?
A. The history of planet Earth includes
alternations between colder periods
("icehouses") and warmer periods
("greenhouses") on the surface of the planet.
B. The rise of more complex organisms such
as eukaryotes has resulted in a reduction in
diversity of more "primitive" organisms such
as bacteria.
C. There have been repeated incidents of
mass extinction in the history of the planet in
which species diversity has been reduced by
50% or more.
B
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Water is always released as a product in hydrolysis reactions
__________________Indicate whether the statement is true or false.
All of the following are characteristics of vertebrates EXCEPT
A. postanal tails. B. vertebral columns. C. internal organs. D. exoskeletons. E. skulls.
Streptococcus pneumonae can be diferentiated best from the viridans group of streptococci by
A. Bile solubility B. Colonial morphology C. Gram stain D. Hippuricase and ninhydrin
Which of the following does not require expenditure of energy?
A. flow of sucrose and other carbohydrates once inside the sieve tubes B. opening or closing stomata C. accumulation of ions inside a cell D. the loading and unloading of carbohydrates from the sieve tubes E. transport against a concentration gradient