Ward's World + McGraw Hill's AccessScience

Ward's World+McGraw Hill Bacteriology_TeacherKey

Issue link: https://wardsworld.wardsci.com/i/1321066

Contents of this Issue


Page 0 of 0

Bacteriology: Test Your Understanding Teacher's Guide + ward ' s science Why are bacteria ecologically important? Sample answer: Bacteria are important in the recycling of materials essential to plants and animals. Bacteria also help plants by breaking down complex substances to carbon dioxide, which plants need to grow. Further, bacteria convert certain nitrogenous substances into forms that plants can use. How do bacterial cells differ from plant and animal cells? Bacterial cells are simpler than plant and animal cells. Bacteria have no discrete, membrane-bound nucleus and no membrane-bound organelles. Bacteria also possess small pieces of DNA called plasmids, which plant and animal cells do not have. What was the significance of the discoveries by Robert Koch and Louis Pasteur in the late 1800s? Koch's discovery that bacteria can cause disease, along with Pasteur's discovery that bacteria can create immunity to disease, led to a golden era of study of the cause and control of bacterial disease among humans, and of immunization as a means to combat disease. What are some common products that rely on bacteria? Some common products that rely on bacteria include cheese, sauerkraut, pickles, sausage, and antibiotics. Critical Thinking: What does "physiological diversity" mean in the context of bacteria? Provide examples in your answer. Sample answer: Physiological diversity means that different species of bacteria survive, grow, and obtain energy in a variety of ways. For example, some bacteria photosynthesize in the presence of oxygen, whereas others survive in oxygen-free environments and use fermentation to obtain energy.

Articles in this issue

Links on this page

Archives of this issue

view archives of Ward's World + McGraw Hill's AccessScience - Ward's World+McGraw Hill Bacteriology_TeacherKey