Bio 251 Exam 2 Questions And Answers Verified 100% ( A Score)

Know the features/distinct characteristics/infections, etc. of Rhizobium {Ans: Important nitrogen-fixing bacteria Lives in the roots of legume plants such as clover, alfalfa and peas Rhizobium produce ammonia, which is then used by plants}What is the nature of Mycobacterium in terms of its habitat? {Ans: widespread in nature; saprophytes (breaks down organic matter), disease causing}What is another name for Streptococcus pyogenes? {Ans: Beta-hemolytic group A streptococci}What are the typical oxygen requirements and habitats of Bacillus species? {Ans: -obligate aerobes or facultative anaerobes -found in the environment (soil), animals}Explain the cholera toxin example of transduction {Ans: -Gene encoding cholera toxin is introduced to bacteria via a bacteriophage, which carries the cholera toxin gene -Pathogenic strains of V. cholera result from horizontal gene transfer mechanism of transduction V. cholerae that have undergone lysogenic conversion Are now able to produce cholera toxin (ask her about this too)}What is meant by zoonoses {Ans: Disease or infection that is naturally transmissible from animals to humans; typically referring to vertebrae animals Many viral pathogens have an animal origin or animal host/reservoir Some viruses can become humanized and can no longer affect the animal host (measles, HIV, Sars-Cov2) Ebola - bats​ Rabies