The first primitive eukaryotic cells likely evolved from
a. archea.
b. bacteria.
c. prokaryotes.
d. the last common ancestor.
e. None of the choices is correct.
Answer: d. the last common ancestor.
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Carrots are orange because of which pigment?
a. anthocyanin b. beta-carotene c. chlorophyll a d. chlorophyll b e. phycoerythrobilin
How many ATP are spent before a glucose molecule can be broken down to release energy?
a. one b. two c. three d. four e. six
Plants produce biomass by taking in energy, CO2, and nutrients from the environment; consumers eat much of this biomass, but not all. However, ecosystems do not indefinitely accumulate large quantities of organic matter over time. Why not?
What will be an ideal response?
Vegetarians who rely upon a single type of plant food
A) may become severely dehydrated. B) run the risk of depleting their liver of glycogen. C) are soon unable to produce sufficient quantities of bile. D) may become protein-deficient.