The pH in the rumen of corn-fed cows is imbalanced and harbors E. coli bacteria (such as strain O157:H7) which is especially pathogenic to humans. True False
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The pH in the rumen of corn-fed cows is imbalanced and harbors E. coli bacteria (such as strain O157:H7) which is especially pathogenic to humans.
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False
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- Which of the following has the highestprotein content per gram?A. AppleB. GroundnutC. SoyabeanD. WheatThe pH of human stomach acid ranges from 1.0 to 3.0, whereas a healthy esophagus has a pH of approximately 7.0. In gastroesophageal reflux disease (GERD), often called acid reflux, stomach acid flows backward from the stomach into the esophagus. Repeated episodes in which esophageal pH goes below 4.0, considered clinical acid reflux, can result in bleeding ulcers and damage to the esophageal lining. The data in the Figure, from a patient with GERD, show esophageal pH during a sleeping reflux event. How many minutes does it take to go from the peak of the reflux event (when pH is most acidic) to when the reflux event is over? Source: Based on T. Demeester et al. 1976. Patterns of gastroesophageal reflux in health and disease. Annals of Surgery 184:459469.In biological systems, buffers are important because they facilitate changes in pH to enhance biological activities of proteins and nucleic acids. True False
- the amino acid proline has a net negative charge at Ph of 12 true of falseWhich of the following bacteria is an acid fast ? a) E.coli b)Pseudomonas aeruginosa c) Bacillus subtilis d ) Norcadia asteroides e) Streptococcus pneumoniaeHow does your Mycobacterium tuberculosis pathogen obtain the requirements to build its biological macromolecules? discussing where your bacteria gets its basic requirements for the elements of life - carbon, hydrogen, oxygen, nitrogen, phosphorus and sulfur. Basically the nutritional requirements, not specifically each element individually.
- Two factors affecting the amount of usable nitrogen in thesoil are a limited number of nitrogen-fixing bacteria and_________________________.14C-labeled cellulose is added to a vial containing some anoxic freshwater lake sediments and sealed under anoxic conditions. A few hours later, 14CH4 appears in the vial. Discuss what has happened to yield such a resultThe enzyme tryptophanase splits the amino acid tryptophan into ________ and pyruvic acid (plus ammonia). Adding ______ will react and turn red indicating the bacteria make the tryptophanase enzyme. Answer Choices: A. indole; Kovac’s B. sulfur; Iodine C. indole; ferric chloride D. sulfur; Kovac’s
- The lipopolysaccharide of Gram-negative bacteria is composed of the following EXCEPT: Phospholipid Lipoteichoic acid Polysaccharide O-PolysaccharideHemoglobin is an enzyme containing amino acids linked by peptide bonds. Select one: True FalseFoodborne illness is associated with many different types of foods. Explain what the oxygen requirements would be for microbes that cause foodborne illness associated with canned foods and why it helps in this situation.
