Practice mode / Biotechnology What is a transgenic organism? A Option A: An organism that is genetically identical to its parent by natural budding B Option B: An organism produced by sexual reproduction only C Option C: An organism that has lost all its genes D Option D: An organism containing a gene transferred from another species Correct answer D. An organism containing a gene transferred from another species Explanation Transgenic organisms carry foreign DNA inserted by genetic engineering, such as Bt cotton with a bacterial toxin gene or bacteria producing human insulin. Show answer Report a problem Answer checked 11 October 2026 · How we write and check questions
Question 01 / Biotechnology What type of sequence do most restriction endonucleases recognise in DNA? A Option A: Short palindromic sequences B Option B: Only the start codon AUG C Option C: Long sequences of repeated adenine D Option D: Random sequences changing every time Correct answer A. Short palindromic sequences Show answer Open question
Question 02 / Biotechnology What are ‘sticky ends’ produced by some restriction enzymes? A Option A: Ends joined by covalent bonds to RNA B Option B: Short single-stranded overhangs with complementary bases C Option C: Ends coated with protein D Option D: Blunt double-stranded ends Correct answer B. Short single-stranded overhangs with complementary bases Show answer Open question
Question 03 / Biotechnology Which enzyme seals the sugar-phosphate backbone when a gene is inserted into a plasmid? A Option A: Reverse transcriptase B Option B: RNA polymerase C Option C: DNA ligase D Option D: Restriction endonuclease Correct answer C. DNA ligase Show answer Open question
Question 04 / Biotechnology Why do plasmid vectors often carry a gene for antibiotic resistance? A Option A: To make the inserted gene express faster B Option B: To act as a marker for selecting bacteria that have taken up the plasmid C Option C: To kill the host bacterium after cloning D Option D: To cut DNA at specific sites Correct answer B. To act as a marker for selecting bacteria that have taken up the plasmid Show answer Open question
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