Questions 29-32 LAC OPERON STRUCTURE Regulatory Promoter Operator Gene Structura
ID: 269683 • Letter: Q
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Questions 29-32 LAC OPERON STRUCTURE Regulatory Promoter Operator Gene Structural Genes lacz lacYlacA DNA PIach The functions of the loci of the lac operon shown in the diagram are described in the table below Locus Function Attachment site for RNA polymerase Encodes a repressor protein that prevents transcription of the structural genes of the lac operon Attachment site for RNA polymerase lacl Operator Binding site for the repressor protein lacz lacY locA Encodes galactoside transacetylase Encodes beta-galactosidase, the enzyme that digests lactose to glucose and galactose lactose permease, the channel through which lactose moves into the cell The diagram above represents a segment of the E coli chromosome that contains the laci gene and part of the lac operon, a coordinately regulated set of genes that are required for the metabolism of lactose. The presence of lactose, which causes the repressor to be released from the operator, results in increased transcription of the lac operonExplanation / Answer
25.
Uracil is represent in RNA and Thymine is present in DNA.
in DS DNA A binds with T and G binds with C or vice versa, so in DS DNA A=T AND G=C.
As here, due to presence of Thymine is DNA, as the %A not equals to %T and %G not equal to %C, which indicates that the DNA is, single stranded.
Hence the answer is B. Single standed DNA.
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