Why do researchers think the first self-replicating molecule was RNA?
A) RNA is the only type of molecule that can catalyze a chemical reaction.
B) RNA can carry information and catalyze chemical reactions.
C) Self-replicating molecules of RNA exist today, in human cells.
D) Fossil evidence of such a molecule was recently discovered.
Answer: B
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In Thomas Hunt Morgan's experiments, males had white eyes but females did not. What cross could you perform with his flies to obtain white-eyed females?
A. cross the F1 offspring to each other. B. cross an F1 female to a white-eyed male. C. cross an F2 female with an F1 male. D. cross an F2 female with a white-eyed male. E. crossing either the F1 or F2 females with a white-eyed male will produce some white-eyed females.
Which of these statements is true of the energy in an open system containing living organisms?
a. The system will quickly settle into equilibrium. b. This system will generate a net surplus of energy. c. There must be a net influx of energy to this system. d. Energy transfers cannot be tracked in open systems.
The accompanying figure most closely represents speciation by ________
A) natural selection B) reinforcement C) hybridization D) polyploidy
Light-dependent photosynthetic pathway that is used to generate ATP and NADPH; because the pathway is noncyclic, the electrons must be replaced by the splitting of water (photolysis).
What will be an ideal response?