State that some substances move into and out of cells by diffusion through the cell membrane
State that some substances move into and out of cells by diffusion through the cell membrane
1 Answer
Questions and Answers For
IGCSE Biology
318 Questions
Ask a question
State that the energy for diffusion comes from the kinetic energy of random movement of molecules and ions
State that the energy for diffusion comes from the kinetic energy of random movement of molecules and ions
1 Answer
Describe diffusion as the net movement of particles from a region of their higher concentration to a region of their lower concentration (i.e. down a concentration gradient), as a result of their random movement
Describe diffusion as the net movement of particles from a region of their higher concentration to a region of their lower concentration (i.e. down a concentration gradient), as a result of their random movement
1 Answer
Calculate magnification and size of biological specimens using millimetres as units
Calculate magnification and size of biological specimens using millimetres as units
1 Answer
State and use the formula: magnification = image size ÷ actual size
State and use the formula: magnification = image size ÷ actual size
1 Answer
Describe the meaning of the terms: cell, tissue, organ, organ system and organism as illustrated by examples given in the syllabus
Describe the meaning of the terms: cell, tissue, organ, organ system and organism as illustrated by examples given in the syllabus
1 Answer
State that specialised cells have specific functions, limited to: (a) ciliated cells – movement of mucus in the trachea and bronchi (b) root hair cells – absorption (c) palisade mesophyll cells – photosynthesis (d) neurones – conduction of electrical impulses (e) red blood cells – transport of oxygen (f) sperm and egg cells (gametes) – reproduction
State that specialised cells have specific functions, limited to: (a) ciliated cells – movement of mucus in the trachea and bronchi (b) root hair cells – absorption (c) palisade mesophyll cells – photosynthesis (d) neurones – conduction of electrical impulses (e) red blood cells – transport of oxygen (f) sperm and egg cells (gametes) – … Read more
1 Answer
State that new cells are produced by division of existing cells
State that new cells are produced by division of existing cells
1 Answer
Describe the structure of a bacterial cell, limited to: cell wall, cell membrane, cytoplasm, ribosomes, circular DNA, plasmids
Describe the structure of a bacterial cell, limited to: cell wall, cell membrane, cytoplasm, ribosomes, circular DNA, plasmids
1 Answer
Describe and compare the structure of a plant cell with an animal cell, limited to: cell wall, cell membrane, nucleus, cytoplasm, chloroplasts, ribosomes, mitochondria, vacuoles
Describe and compare the structure of a plant cell with an animal cell, limited to: cell wall, cell membrane, nucleus, cytoplasm, chloroplasts, ribosomes, mitochondria, vacuoles
1 Answer
Welcome to our Q&A page! Here, you can find answers to frequently asked questions about our courses, features, and other topics related to our content. If you have a question that's not covered, feel free to ask, and we'll be happy to help!
Quiz Leaderboard
1st
Sourav
Score: 90%
Questions: 20
2nd
Priyanka
Score: 90%
Questions: 10
3rd
Vesnce
Score: 45%
Questions: 20
4th
Hector
Score: 40%
Questions: 10
Top Questions
-
Discuss the advantages and disadvantages of genetically modifying crops, including soya, maize and rice
Sourav
-
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
-
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
-
Describe genetic modification as changing the genetic material of an organism by removing, changing or inserting individual genes
-
Describe and explain the conditions that need to be controlled in a fermenter, including: temperature, pH, oxygen, nutrient supply and waste products
-
Describe how fermenters can be used for the large-scale production of useful products by bacteria and fungi, including insulin, penicillin and mycoprotein
