20.Regarding ribozymes, which of the following is/are CORRECT? (A) They are essentially RNA and possess catalytic activity (B) They absolutely require proteins to catalyze reactions (C)They serve as partial evidence supporting the "RNA World" hypothesis (D)The catalytic core of the ribosome is primarily contributed by rRNA (E) A ribozyme is equivalent to a DNA polymerase.

8. Which are the characteristics of genetic analysis? (A) Some of alleles can exhibit both recessive and dominant properties. (B) Dominant alleles are often the consequence of a mutation that causes some kind of gain of function. (C)Dominant mutations in certain genes are associated with a loss of function. (D)Dominant negative produces a phenotype similar to that obtained from a loss-of function mutation. (E)Recessive and dominant mutant alleles generally have opposite effects on gene function.

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