A tRNA molecule with an anticodon sequence of 3\' AAG 5\' will bind the the mess

Question

A tRNA molecule with an anticodon sequence of 3' AAG 5' will bind the the messenger RNA codon Select one: a.5, TTC 3' b. 3 CUU 5 O c. 5' CUU 3 O d. 3' UAG 5 All of the following statements regaring the lac operon are correct EXCEPT Select one: a. Allolactose, an isomer of lactose, represses the operon by activating the repressor. b. Transcription of B-galactosidase only occurs when lactose is present c. When lactose is not present, the lac repressor is active and bound to the operator. O d. It is an inducible operon. Gene amplification results in Select one: a. the loss of certain genes. b. nucleotide sequences that do not code for proteins. O c. an increase in the number of copies of certain genes O d. the conversion of RNA back to DNA

Explanation / Answer

Answer:

Coding DNA is equal to mRNA except in the place of place of thymine in DNA, uracil will be in RNA.

Answer:

1). B. 3’ CUU 5’

Explanation: A=U & G=C, 5’=3’ or 3’=5

2). A. Allolactose, an isomer of lactors, represses the operon by activating the repressor

Explanation:

The E. coli lac operon is only expressed if allolactose (a lactose isomer formed by -galactosidase) binds and inactivates the lac repressor.

3). C. An increase in the number of copies of certain genes

Explanation: Gene amplification means to increase the number of genes.

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