It looks ______ you are ill. You should go to see the doctor.
A.
as
B.
as though
C.
as well
D.
even though
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【多选题】What is human retrotransposon L1 element?
A.
One abundant human retrotransposon, the L1 element (sometimes referred to as LINE-1, a long interspersed nuclear element), is transcribed into RNA by a host cell’s RNA polymerase.
B.
A double-stranded DNA copy of this RNA is then made using an enzyme called reverse transcriptase, an unusual DNA polymerase that can use RNA as a template.
C.
The reverse transcriptase is encoded by the L1 element itself.
D.
The DNA copy of the element is then free to reintegrate into another site in the genome.