試題詳解

32. Which of the following is NOT true?
(A) Because DNA polymerases polymerize DNA only in the 5'-to-3' direction, synthesis of the lagging strand at a replication fork must occur discontinuously through a backstitching mechanism that produces short DNA fragments.
(B) When the replication fork reaches an end of a linear chromosome: there is no place to produce the RNA primer needed to start the last Okazaki fragment at the very tip of a linear DNA molecule.
(C) In human, telomeres consist of many tandem repeats of a short sequence that contains a block of GGGTTA, extending for about 10,000 nucleotides.
(D) The telomerase synthesizes a new copy of the repeat, using a loop-back protruding single-stranded DNA template from another strand.