(a) Explain what is meant by the term antibiotic.(b) Explain why(i) only a few bacteri a grew in dish B compared with dish A,(ii) more bacteri a grew in C than in B.(c) Fig. 4.1 shows the effect of an antibiotic on a species of disease-causing bacterium.Suggest why antibioti...
Earth is home for all living things-humans, animals,plants, and even tiny microbes.To study a house is to learn how its residents(居民) use it. An ecologist is a scientist who studies the 3 between organisms(生物) and their environment.The environment is an organism's surroundings. It ...
Restricted use of antibiotics in organic farming has led to concern about high levels of microbes in manure, in turn causing food poisoning such as E. coli. There is a lack of sufficient evidence to prove organics suffer from a higher than conventional level of microbes, but right now studies...
Which of these cells kill by engulfing and destroying invading microbes? a. phagocytic cells b. lymphatic cells c. basophils d. natural killer cells Which of the following is the largest in size? A. Escherichia coli (bacteria) B. Amoeba proteus (protoz...
What is meant by immune deficiency? Define the following terms: acquired immunity, cell-mediated immunity, humoral immunity, hypersensitivity. How do microbes evade humoral immunity? Describe artificially (induced) active immunity. Describe naturally passive immunity. Summarize humoral immunity. Describe the...
The “house” Haeckel had in mind is our 2 , Earth. Earth is home for all living things—humans, animals, plants, and even 3 microbes. To study a house is to learn how its residents(居民)use it. An ecologist is a scientist who studies the 4 between organisms (生物)and their ...
He joined two Greek _1_:"oikos", meaning "house", and "logie", meaning “the study of". Together they mean"the study of the house". The " house" Haeckel had in mind is our _2_, Earth. Earth is home for all living things-humans, animals, plants, and even _3_ microbes (微...
Once your compost is done, it is ready to use. Finished composts can do the following: Improve the soil structure in your garden or yard Increase the activity of soil microbes Enhance the nutrients of your soil Improve the chemistry of your soil, particularly the degree of acidity (pH) Insu...
What advantage is afforded by bacterial cells that secrete antibiotics in the soil? Describe the color (in a gram stained smear) of gram-positive and gram-negative bacteria. What is the advantage of culturing microbes on slides? What are the advantages and disadvantages of penicillin antibiotics?
What is meant by "causative microorganism"? What is the causative agent of MRSA? What did microbiologists contribute to the germ theory of disease? What type of organism causes amoebic dysentery? Who named microbes animalcules? What type of microorganism causes HIV infection?