Explain why the transfer of energy from one trophic level to another is inefficient
Explain why the transfer of energy from one trophic level to another is inefficient
1 Answer
Questions and Answers For
O Level Biology
234 Questions
1 Answer Describe food webs as networks of interconnected food chains and construct and interpret them
Describe food webs as networks of interconnected food chains and construct and interpret them
1 Answer Describe the terms producer, consumer, herbivore, carnivore and decomposer
Describe the terms producer, consumer, herbivore, carnivore and decomposer
1 Answer Construct and interpret simple food chains
Construct and interpret simple food chains
1 Answer Describe the flow of energy through food chains and webs including energy from light and energy in living organisms and its eventual transfer to the environment
Describe the flow of energy through food chains and webs including energy from light and energy in living organisms and its eventual transfer to the environment
1 Answer Explain why most forms of life are completely dependent on photosynthesis
Explain why most forms of life are completely dependent on photosynthesis
1 Answer Describe that the Sun is the principal source of energy input to most biological systems
Describe that the Sun is the principal source of energy input to most biological systems
1 Answer Discuss potential advantages and risks of genetic modification, limited to modifying crop plants and bacteria
Discuss potential advantages and risks of genetic modification, limited to modifying crop plants and bacteria
1 Answer Outline the use of genetic modification in crop plants by inserting genes: (a) to confer resistance to herbicides (b) to confer resistance to insect pests (c) to provide additional vitamins
Outline the use of genetic modification in crop plants by inserting genes: (a) to confer resistance to herbicides (b) to confer resistance to insect pests (c) to provide additional vitamins
1 Answer Explain that the gene that controls the production of human insulin has been inserted into bacterial DNA, for commercial production of insulin
Explain that the gene that controls the production of human insulin has been inserted into bacterial DNA, for commercial production of insulin
1 Answer
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drifting movement in fishes during migration
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Topoisomerase: – A. Separates the DNA strands at the origin – B. Keeps the single-stranded DNA regions from coming back together – C. Re-coils the DNA into a helix after replication is complete – D. Breaks DNA backbone to remove tension produced by the helicase – E. Breaks hydrogen bonds between DNA and the RNA primers
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