What evidence contributed to the formulation of the RNA-first hypothesis?
A. More primitive cells, such as archaea, use an RNA only information system.
B. RNA continues to evolve chemically today.
C. Protocells contain only RNA and lipids.
D. RNA was formed in MIller's experiment.
E. RNA can sometimes be both a substrate and an enzyme during RNA processing.
Answer: E
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Suppose you wanted to investigate ideas on how polymerization of prebiotic organic molecules may have occurred on the early Earth. Which of the following scenarios might best be utilized for this?
A. Mix some RNA nucleotides in water and heat them to boiling temperatures. B. Mix some amino acids (protein building blocks) in water and add a strong acid or a strong base. C. Mix some RNA nucleotides in water and repeatedly wet and dry them on clay. D. Mix some amino acids (protein building blocks) in water and add a bacterium harmless to humans. E. Mix some amino acids in salt water and cool down to 0? C.
Florists often create brightly colored flowers by immersing the stems in colored water. Which
cells are primarily responsible for this color change?
a. phloem b. xylem c. xylem and phloem d. neither xylem nor phloem
A study finds a positive correlation between the number of spots on the tail of male peacocks and their mating success. What would be the best followup experiment?
A. Count the number of spots on female tails and measure mating success. B. Remove spots or add artificial spots to male tails and determine female responses. C. Measure the sperm count of males and compare to spot count. D. Inject testosterone and observe changes in spot count. Clarify question: What is the key concept addressed by the question? What type of thinking is required? Gather Content: What do you already know about sexual selection and planning an experiment? What other information is related to the question? Choose Answer: Given what you now know, what information is most likely to produce the correct answer? Reflection: Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Science is based on
a. faith. b. authority. c. evidence. d. force. e. consensus.