Biology Homework Assistance
The most challenging aspect of biology education is making students grasp the microscopic realm of biology, delving into cells and exploring genes and molecules. However, with the advent of information technology, biology homework assistance can play a crucial role when neither words nor illustrations suffice to elucidate biology concepts.
QuestionAI is an online biology learning platform that aids in learning and mastering biology concepts, featuring a variety of experiments and corresponding exercises, a departure from conventional biology question aids. Here, you can simulate experiments to replicate experimental scenarios, delving deeper layer by layer to comprehend and internalise key concepts.
- rence Teixobactin is a new antibiotic discovered in 2015. It was the first antibiotic to be discovered for around 30 years. Extracts from soil bacteria had shown that the species Eleftheria terrae contained an antibiotic substance.This substance was effective against several pathogens of humans including Mycobacterium tuberculosis. However , this bacterium could not be grown in a lab and so a new technique had to be develope so that the bacterial cells could be grown in pure cultures (cultures that contain only one bacterial species) in the soil. The antibiotic purified from Eleftheria was called teixobactin. Teixobactin works by binding to a lipid molecule that some kinds of bacteria use to make their cell walls.The binding prevents the bacterium from using the lipids, so the cell wall is weakened Osmosis into the cell cause the bacterial cell membrane to burst Teixobactin is the first antibiotic to be developed that affects lipids.Other antibiotics usually act against proteins . Scientists hope that the way teixobactin works will reduce the risk of bacteria developing resistance to it, as they have to other antibiotics. Clinical trials of teixobactin are unlikely to happen before 2017 Those will take another two to three years, and the total cost of development, if the antibiotic is successful will be more than E50 million. It is uncertain ye whether any drug company will want to spend this amount to complete the testing, as they will not earn mone from the drug until it is used by doctors. 1 Explain what is meant by antibiotic. 2 Explain why Eleftheria terrae is difficult to grow in culture. 3 Explain the role of osmosis in the antibiotic effect of teixobactin. 4 Explain why teixobactin should be safe to use in human cells. 5 Pre-clinical testing of teixobactin has been done on infected human cells. Describe the remaining stage of testing that are needed before the new antibiotic can be licensed for use by doctors. Explain why each the stages is carried out. 6 The rapid rise in resistance of pathogenic bacteria to all antibiotics is of great concern. a Explain why this makes it essential that research finds new ways to control pathogenic bacteria. b Suggest how the risk of developing resistance to a new antibiotic explains the lack of development of new antibiotics. Extra challenge 7 There are millions of species of soil bacteria Suggest an explanation for why Eleftheria terrae makes teixobactin.
- 7. What term means the physical area where an organism lives? A Biotic factor B Abiotic factor C Niche D Habitat
- Choose the best answer. 8. A tapeworm that lives in the intestines of a dog is an example of square A. commensalism B. mutualism
- 4. Aphids provide food for ants, and ants protect aphids against enemies. What is the term for this type of interaction? A Sustainability B Commensalism C Mutualism D Parasitism
- The example of square A. clownfish and sea anemones living together B. tapeworms infecting a human square square