The ultimate source of all energy in a terrestrial
ecosystem is
a. the organic matter in all the organisms of the
ecosystem.
b. electrons from water molecules.
c. sunlight.
d. ATP.
e. inorganic mineral ions in the soil.
Answer: c
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Over geological time, organic matter from seedless vascular plants, buried beneath ____, formed the fossil fuels we
use today.
a. agricultural fields b. ocean and river sediments c. volcanic ash d. granitic and basaltic rock e. Earth’s mantle
The above figure is a photograph of
a. a plant with root nodules. b. mycorrhizae. c. root hairs. d. a demonstration of the effect of mutualistic Rhizobium. e. a microscopic view of a nodule forming around area where the bacterium infect.
The extent to which a given gene is transcribed presumably depends upon __________.
a) the combination of initiation factors bound to its upstream regulatory elements b) the combination of translational factors bound to its upstream regulatory elements c) the particular combination of transcription factors bound to its upstream regulatory elements d) the single transcription factor bound to its upstream regulatory elements e) the particular combination of transcription factors bound to its downstream regulatory elements
Trypanosomes are effective parasites of humans because they evade the immune system by __________.
a. colonizing the exterior, rather than the interior, of the body b. entering cells of the immune system itself c. sequentially changing surface proteins d. only spending a short period of time in the body before moving on to another host e. producing highly specialized cells that together make up an integrated, multicellular organism