Sea urchins are mostly carnivores
Indicate whether the statement is true or false
F
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Which of the following was produced in experiments on primitive Earth conditions conducted by Miller-Urey and others?
A. ammonia and water B. amino acids C. CO2 and H2O D. ammonia and hydrogen sulfide E. methane and oxygen
What is the proton-motive force?
a. the force needed to move protons into the inner mitochondrial space b. the amount of energy required to protonate a glucose molecule c. the free energy associated with the removal of hydrogen from NADH d. the combination of a proton and voltage gradient across the inner mitochondrial membrane e. the synthesis of ATP from a proton gradient
The Calvin cycle of a plant exposed to light during the day that is suddenly put in the dark
A. cannot run, as it requires light energy directly. B. runs in a different place in the plant. C. can still run as long as there is ATP, CO2, and NADPH present. D. uses a different source of carbon.
Ethylene is an organic compound produced by ripening fruits. In a controlled experiment, researchers found that ethylene gas stimulated the ripening process in newly harvested fruits. Which of the following describes the most likely connection between natural ethylene production and fruit ripening?
(A) As a result of metabolic inactivity, newly harvested fruits are unable to absorb ethylene gas from the atmosphere. (B) Ethylene gas is a chemical signal through which ripening fruits trigger the ripening process in other fruits. (C) Because of normal phenotypic variation, only some of the fruits in a given generation are expected to produce ethylene gas. (D) The rate of ethylene gas production by ripening fruits is an indicator of the relative age of an ecosystem.