Which of the following is a correct statement about the currently accepted "rna world hypothesis" which possibly to explain the evolution sequence of dna, rna, and proteins?
a) rna arose from dna
b) dna arose from rna
c) proteins were the first catalysts
d) dna was the first catalyst
e) the current protein translation system under which genomic dna is transcribed into rna and rna is then translated into proteins which function as catalysts in enzymatic reactions has always existed. no previous variable transcription/translation system existed.

Which statements best describe the differences or similarities between a comparative investigation and an experimental investigation? check all that apply. experimental investigations are best for showing cause-and-effect relationships, while comparative investigations do not necessarily show this type of relationship. comparative investigations are often impractical and unrealistic, while experimental investigations are the most practical and realistic kinds of investigations. comparative investigations allow for the use of a wide range of variables but do not have a control group, while experimental investigations involve variables that can be controlled. both experimental investigations and comparative investigations are designed to answer scientific questions. both experimental investigations and comparative investigations focus on making observations rather than collecting new data.

Which of the following is required of a new drug?me

Which of the following is the sl unit used to measure temperature a. kilogram b. liter c. meter d. kelvin