As plant cells rely on energy obtained directly from the sun to carry out any cellular processes, sugars are only used as backup energy sources for plants on cloudy days.
a. true
b. false
Ans: b. false
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____ is the maintenance of a stable internal environment in the face of a changing external environment
Fill in the blank with the appropriate word.
Stromatolites are
A. layered rocklike structures formed by cyanobacteria. B. the earliest known arthropods. C. autotrophs living around deep sea vents. D. heterotrophs found in marine environments. E. fossilized coral reefs.
Which type of tropism will cause a plant to orient part of its body in order to maximize exposure to blue light? a. Phototropism b. Gravitropism c. None of these choices
d. Thigmotropism e. Solar tracking
What advantageous uses have viruses been shown to have?
A) The activities of viral genes mimic those of host genes so they are useful for studying mechanisms of DNA replication and gene expression in their much more complex hosts B) all of the choices are correct C) Bacteria-killing viruses may play an increasing role in the way against bacterial pathogens D) insect killing viruses may play an increasing role in the way against insect pests E) They can be used as a means to introduce foreign genes into human cells, which may serve as a basis for treatment of human diseases by gene therapy