All living organisms are dependent upon plants because
a. plants produce carbon dioxide as a by-product of photosynthesis.
b. as producers, they form the base of food chains.
c. they function to prevent erosion and reduce desertification.
d. they remove oxygen from the atmosphere.
e. they contribute to the problems generated by the greenhouse effect.
B
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Mutations generated during site-directed mutagenesis occur randomly in the genome
Indicate whether the statement is true or false
Which of the following is the correct sequence of events in cross-bridge cycling?
A. Myosin cross-bridge binds to actin, the powerstroke moves the thin filament relative to the thick filament, ATP binds to myosin and cross-bridge detachment occurs, ATP is hydrolyzed and the myosin head is "cocked." B. The powerstroke moves the thin filament relative to the thick filament, myosin cross-bridge binds to actin, ATP binds to myosin and cross-bridge detachment occurs, ATP is hydrolyzed and the myosin head is "cocked." C. Myosin cross-bridge binds to actin, ATP is hydrolyzed and the myosin head is "cocked," the powerstroke moves the thin filament relative to the thick filament, ATP binds to myosin and cross-bridge detachment occurs. D. Myosin cross-bridge binds to actin, ATP binds to myosin and cross-bridge detachment occurs, the powerstroke moves the thin filament relative to the thick filament, ATP is hydrolyzed and the myosin head is "cocked." E. These events can occur in any sequence without affecting muscle function.
Which of the following spores is the result of asexual reproduction?
A. sporangiospores B. ascospores C. zygospores D. basidiospores
Light reactions use sunlight as energy source The light reactions use sunlight as the energy source.
a. true b. false