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| # | Question | Subject and topic | Difficulty |
|---|---|---|---|
| 1641 | In a sewage treatment plant, the masses of bacteria associated with fungal filaments that form in aeration ta… | Biology/Biological Studies/Biotechnology/Biochemistry Sewage treatment and biogas |
Easy |
| 1642 | Water sample P has a BOD much higher than sample Q. What does this indicate? | Biology/Biological Studies/Biotechnology/Biochemistry Sewage treatment and biogas |
Medium |
| 1643 | Why is a part of the activated sludge pumped back into the aeration tank? | Biology/Biological Studies/Biotechnology/Biochemistry Sewage treatment and biogas |
Medium |
| 1644 | Cattle dung is a good raw material for biogas plants mainly because it | Biology/Biological Studies/Biotechnology/Biochemistry Sewage treatment and biogas |
Hard |
| 1645 | Which organism is commonly used as a biocontrol agent against aphids? | Biology/Biological Studies/Biotechnology/Biochemistry Biocontrol agents and biofertilisers |
Easy |
| 1646 | Which of the following is a free-living nitrogen-fixing bacterium used as a biofertiliser? | Biology/Biological Studies/Biotechnology/Biochemistry Biocontrol agents and biofertilisers |
Easy |
| 1647 | The main benefit a plant gets from a mycorrhizal fungus such as Glomus is | Biology/Biological Studies/Biotechnology/Biochemistry Biocontrol agents and biofertilisers |
Medium |
| 1648 | Cyanobacteria are especially valued as biofertilisers in | Biology/Biological Studies/Biotechnology/Biochemistry Biocontrol agents and biofertilisers |
Medium |
| 1649 | A farmer practising integrated pest management wants an agent that kills a specific insect pest but spares be… | Biology/Biological Studies/Biotechnology/Biochemistry Biocontrol agents and biofertilisers |
Hard |
| 1650 | In 1972, the first recombinant DNA was constructed by | Biology/Biological Studies/Biotechnology/Biochemistry Principles of biotechnology |
Easy |
| 1651 | Which DNA sequence is responsible for starting replication of a cloned gene inside a host cell? | Biology/Biological Studies/Biotechnology/Biochemistry Principles of biotechnology |
Easy |
| 1652 | Keeping a fermentation vessel free of unwanted microbes while growing only the desired cells in bulk is the m… | Biology/Biological Studies/Biotechnology/Biochemistry Principles of biotechnology |
Medium |
| 1653 | Compared with traditional hybridisation, the main advantage of genetic engineering is that it | Biology/Biological Studies/Biotechnology/Biochemistry Principles of biotechnology |
Medium |
| 1654 | A researcher injects a linear fragment of human DNA, with no origin of replication, into a bacterial cell. Wh… | Biology/Biological Studies/Biotechnology/Biochemistry Principles of biotechnology |
Hard |
| 1655 | In the name EcoRI, what does the letter R stand for? | Biology/Biological Studies/Biotechnology/Biochemistry Tools of recombinant DNA technology |
Easy |
| 1656 | During agarose gel electrophoresis, DNA fragments move towards the anode because they | Biology/Biological Studies/Biotechnology/Biochemistry Tools of recombinant DNA technology |
Easy |
| 1657 | A foreign gene is inserted at the BamH I site of pBR322 and the plasmid is put into E. coli. Recombinant colo… | Biology/Biological Studies/Biotechnology/Biochemistry Tools of recombinant DNA technology |
Medium |
| 1658 | In blue–white selection, colourless colonies on a chromogenic substrate indicate that | Biology/Biological Studies/Biotechnology/Biochemistry Tools of recombinant DNA technology |
Medium |
| 1659 | Why is a vector with several recognition sites for the same restriction enzyme unsuitable for cloning? | Biology/Biological Studies/Biotechnology/Biochemistry Tools of recombinant DNA technology |
Hard |
| 1660 | Which enzyme is used to break open fungal cells when isolating their DNA? | Biology/Biological Studies/Biotechnology/Biochemistry Processes of recombinant DNA technology |
Easy |