1. A region of DNA in a particular cell synthesizes a segment of RNA that is 174 bases long and in the form of a large palindrome. The RNA is transported to the cytoplasm and folds into a hairpin loop of double stranded RNA. In the cytoplasm, the hairpin loop is recognized by a double-stranded RNA cutting enzyme (dicer) and is cut into 21 BP lengths. When these 21 BP double stranded segments are combined with protein, they function by: Answer choices destroying specific mRNAs priming the synthesis of DNA sequences adding DNA to the chromosome ends (telomeres) acting as decoys for RNA degrading enzymes thus protecting the mRNAs present splicing the introns out of messenger RNA 2. The following are genotypes of merozygotes of E. coli with various combinations of lac operon mutations. Determine the phenotype with respect to beta-galactosidase (z), permease (y), and trans-acetylase (a) of each combination as U = uninducible, I = inducible, and C = constitutive. Choose from the following answers. i+ p+ oc z+ y+ a- / iS p+ o+ z- y+ a+ Answer choices UIC UII IUC ICC CCU CUC UUU
1. A region of DNA in a particular cell synthesizes a segment of RNA that is 174 bases long and in the form of a large palindrome. The RNA is transported to the cytoplasm and folds into a hairpin loop of double stranded RNA. In the cytoplasm, the hairpin loop is recognized by a double-stranded RNA cutting enzyme (dicer) and is cut into 21 BP lengths. When these 21 BP double stranded segments are combined with protein, they function by:
Answer choices
destroying specific mRNAs
priming the synthesis of DNA sequences
adding DNA to the chromosome ends (telomeres)
acting as decoys for RNA degrading enzymes thus protecting the mRNAs present
splicing the introns out of messenger RNA
2.
The following are genotypes of merozygotes of E. coli with various combinations of lac operon mutations. Determine the
i+ p+ oc z+ y+ a- / iS p+ o+ z- y+ a+
Answer choices
UIC
UII
IUC
ICC
CCU
CUC
UUU
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