In the Pliocene, most marsupials in South America went extinct as a result of ________
a. continental movement allowing the influx of placental mammals
b. the formation of Pangea
c. competition from monotremes
d. an asteroid impact
a
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The function of tmRNA in bacteria is to:
A. rescue stalled ribosomes. B. terminate translation at all stopcodons. C. initiate translation at special start codons.
The pages of your textbook consist mainly of material made by multicellular, photosynthetic
organisms that function as producers in ecosystems. These organisms belong to the kingdom ____.
a. Plantae b. Fungi c. Animalia d. “Protist” e. Bacteria
ER
What will be an ideal response?
Why is it beneficial to plants that soil particles have negatively-charged surfaces?
A. Negatively-charged ions are pushed towards the roots. B. Toxic metals are trapped and kept away from the plants. C. It helps maintain the water potential of the soil. D. They capture negatively-charged ions. E. They attract positively-charged ions and prevent them from being washed deep into the soil.