The work of Bartel's group on the ribozyme RNA replicase supports which conclusion?
A) An RNA world could produce molecules that could self-replicate.
B) Natural selection requires human oversight.
C) DNA must have come before RNA.
D) Life cannot come from nonlife.
Answer: A
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a. integrator b. sensor c. stimulus d. response e. effector
A central vacuole of a mature plant cell
A. stores genetic information. B. produces protein. C. produces energy from nutrients. D. produces turgor pressure. E. produces mRNA.
Corn and other grasses have a unique sheath of cells known as the __________ that surrounds and
protects the young shoot. a. coleoptile b. coleorhizum c. cotyledon d. endosperm e. radicle
A mutation that results in the addition or deletion of a single nucleotide and therefore radically changes the amino acid sequence of the resulting polypeptide is known as a ________ mutation
Fill in the blank with correct word.