An organism that acquires energy from the sun and uses C6H12O6 as a carbon source would be classified as a:
A. photoautotroph
B. chemoautotroph
C. photoheterotroph
D. chemoheterotroph
C
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Differentiate between reception, transduction and response in cell signaling and provide an example
What will be an ideal response?
Which statement describes evidence in support of the endosymbiont theory?
A) The sequence of mitochondrial rRNA genes are most similar to the rRNA genes in purple bacteria. B) Mitochondrial and chloroplast DNA is organized into nucleosomes. C) Mitochondria and chloroplasts have genes that allow them to live independently. D) Mitochondria, chloroplasts, and cytoplasmic translation are inhibited by antibiotics such as chloramphenicol.
In the electron transport chain, why do electrons flow in one direction from NADH to O2 rather than the reverse direction, or randomly?
A. Electrons flow from NADH to O2 because NADH has the most negative reduction potential and O2 the most positive with electron carriers in between, each becoming more positive to direct the electron flow. B. Electrons flow from NADH to O2 using ATP as a source of energy to drive the flow against their gradient from most negative reduction potential to most positive. C. Electrons flow from NADH to O2 because the change in free energy directs the electron flow from the molecule with the most positive reduction potential to the one with the most negative. D. Electrons flow from NADH to O2 because NADH has the most positive reduction potential and O2 the most negative with electron carriers in between, each becoming more negative to direct the electron flow.
What stimulates activation of B and T cells?
a. cell recognition of an antigen b. production of complement c. histamine production d. lysozyme release e. cytokine production