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295 questions found · practise this subject as a set Show 20 · 50 per page

#	Question	Subject and topic	Difficulty
201	Which organism is commonly used as a biocontrol agent against aphids?	Biology/Biological Studies/Biotechnology/Biochemistry Biocontrol agents and biofertilisers	Easy
202	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
203	The main benefit a plant gets from a mycorrhizal fungus such as Glomus is	Biology/Biological Studies/Biotechnology/Biochemistry Biocontrol agents and biofertilisers	Medium
204	Cyanobacteria are especially valued as biofertilisers in	Biology/Biological Studies/Biotechnology/Biochemistry Biocontrol agents and biofertilisers	Medium
205	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
206	In 1972, the first recombinant DNA was constructed by	Biology/Biological Studies/Biotechnology/Biochemistry Principles of biotechnology	Easy
207	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
208	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
209	Compared with traditional hybridisation, the main advantage of genetic engineering is that it	Biology/Biological Studies/Biotechnology/Biochemistry Principles of biotechnology	Medium
210	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
211	In the name EcoRI, what does the letter R stand for?	Biology/Biological Studies/Biotechnology/Biochemistry Tools of recombinant DNA technology	Easy
212	During agarose gel electrophoresis, DNA fragments move towards the anode because they	Biology/Biological Studies/Biotechnology/Biochemistry Tools of recombinant DNA technology	Easy
213	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
214	In blue–white selection, colourless colonies on a chromogenic substrate indicate that	Biology/Biological Studies/Biotechnology/Biochemistry Tools of recombinant DNA technology	Medium
215	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
216	Which enzyme is used to break open fungal cells when isolating their DNA?	Biology/Biological Studies/Biotechnology/Biochemistry Processes of recombinant DNA technology	Easy
217	Taq polymerase is preferred in PCR mainly because it	Biology/Biological Studies/Biotechnology/Biochemistry Processes of recombinant DNA technology	Easy
218	Starting from a single double-stranded DNA molecule, how many copies of the target sequence can ideally be ob…	Biology/Biological Studies/Biotechnology/Biochemistry Processes of recombinant DNA technology	Medium
219	Purified DNA is made to precipitate out of solution as fine threads by adding	Biology/Biological Studies/Biotechnology/Biochemistry Processes of recombinant DNA technology	Medium
220	In a continuous-culture bioreactor, used medium is drained out and fresh medium is added. The main purpose is…	Biology/Biological Studies/Biotechnology/Biochemistry Processes of recombinant DNA technology	Hard