How are nervous and hormonal mechanisms involved in the control of digestive juice secretion?
How are nervous and hormonal mechanisms involved in the control of digestive juice secretion?
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Questions and Answers For
IB Biology
662 Questions
How did the falsification of theories about scurvy lead to a new understanding of the disease, particularly the failure of attempts to induce scurvy in laboratory rats and mice?
How did the falsification of theories about scurvy lead to a new understanding of the disease, particularly the failure of attempts to induce scurvy in laboratory rats and mice?
1 Answer
How can databases of nutritional content of foods and software be used to calculate the intake of essential nutrients from a daily diet?
How can databases of nutritional content of foods and software be used to calculate the intake of essential nutrients from a daily diet?
1 Answer
How can the energy content of food be determined by combustion, and why is this method useful?
How can the energy content of food be determined by combustion, and why is this method useful?
1 Answer
How can cholesterol levels in the blood serve as an indicator of the risk of coronary heart disease?
How can cholesterol levels in the blood serve as an indicator of the risk of coronary heart disease?
1 Answer
How does anorexia contribute to the breakdown of heart muscle?
How does anorexia contribute to the breakdown of heart muscle?
1 Answer
How can a deficiency of Vitamin D or calcium lead to conditions like rickets or osteomalacia, and how does this affect bone mineralization?
How can a deficiency of Vitamin D or calcium lead to conditions like rickets or osteomalacia, and how does this affect bone mineralization?
1 Answer
What is phenylketonuria (PKU), what causes it, and how can it be treated?
What is phenylketonuria (PKU), what causes it, and how can it be treated?
1 Answer
How do some mammals produce ascorbic acid, while others require a dietary supply of it, and what is the significance of this difference?
How do some mammals produce ascorbic acid, while others require a dietary supply of it, and what is the significance of this difference?
1 Answer
What are the consequences of starvation, and how does it lead to the breakdown of body tissue?
What are the consequences of starvation, and how does it lead to the breakdown of body tissue?
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Top Questions
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Explain the undesirable effects of deforestation as an example of habitat destruction, to include: reducing biodiversity, extinction, loss of soil, flooding and increase of carbon dioxide in the atmosphere
Deforestation, the large-scale removal of trees from forested areas, has
Sourav
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State that through altering food webs and food chains, humans can have a negative impact on habitats
Humans significantly influence ecosystems by altering food webs and food
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Describe the reasons for habitat destruction, including: (a) increased area for housing, crop plant production and livestock production (b) extraction of natural resources (c) freshwater and marine pollution
Habitat destruction is a critical environmental issue resulting from various
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Describe biodiversity as the number of different species that live in an area
Biodiversity refers to the variety of life forms on Earth,
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Discuss the advantages and disadvantages of genetically modifying crops, including soya, maize and rice
Genetically modified (GM) crops, such as soybeans, maize, and rice,
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Outline the process of genetic modification using bacterial production of a human protein as an example, limited to: (a) isolation of the DNA making up a human gene using restriction enzymes, forming sticky ends (b) cutting of bacterial plasmid DNA with the same restriction enzymes, forming complementary sticky ends (c) insertion of human DNA into bacterial plasmid DNA using DNA ligase to form a recombinant plasmid (d) insertion of recombinant plasmids into bacteria (specific details are not required) (e) multiplication of bacteria containing recombinant plasmids (f) expression in bacteria of the human gene to make the human protein
<h2 class="mb-2 mt-6 text-lg first:mt-3">Process of Genetic Modification Using Bacterial
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Outline examples of genetic modification: (a) the insertion of human genes into bacteria to produce human proteins (b) the insertion of genes into crop plants to confer resistance to herbicides (c) the insertion of genes into crop plants to confer resistance to insect pests (d) the insertion of genes into crop plants to improve nutritional qualities
<h2 class="mb-2 mt-6 text-lg first:mt-3">Examples of Genetic Modification</h2> Genetic modification involves
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