Animal Physiology

Microbiology Lab

Mackenzie Strang Homework Quesons: 10 points 1.How did Max most likely get sick and what was the source of the pathogen? -Max had chicken for dinner the night before he got sick. Chickens feces at the farm were found to carry anbioc resistant E. coli and Salmonella most likely from the amount of anbiocs in the chicken’s food. The doctor menoned that he did not believe the chicken was cooked thoroughly. 2. What type of agar are we using to culture? Is this agar selecve, diﬀerenal, and/or complex? -The plate used to culture was SalmonellaShigella agar (SSA). This agar is selecve because it contains selecve agents that only allow the growth of certain gram-negave bacterial strains and prevent the growth of gram-posive strains. 3. What color do Salmonella appear on this agar and why? - Salmonella appear black on the SSA plate because most Salmonella strains can reduce thiosulfate and produce hydrogen sulﬁde, which reacts with the ferric acid in the medium, making it black. 4. What color do E. coli appear on SSA and why? - E. coli appear red on the SSA plate because the medium contains the pH indicator neutral red. It becomes red when the pH is below 6.8. E. coli can cause this change because it is a lactose fermenng bacterium that converts lactose to lacc acid. 5. Bunsen burners are used extensively in microbiology. Why is it important to work in close proximity to a Bunsen burner in order to minimize contaminaon? -The ﬂame and heat from the Bunsen burner keep away and kill microorganisms that are in the air, which prevent the plate from being contaminated and overrun with other organisms. 6. Why was Max’s infecon so hard to treat? -Max’s infecon was caused by an anbioc resistant strain of Salmonella , which means that any anbiocs he was treated with that would normally work on a bacterial infecon, were not having any eﬀect.

BIO | 311 | Microbiology Lab | homework | Mackenzie Strang Homework Ques

Animal_Physiology.docx.docx-Animal Physiology Fourth Edition  Back

Animal Physiology Fourth Edition  Back to site Quiz Results for Chapter 22 Quiz The respiratory gas(es) is(are)   a. oxygen.   b. carbon dioxide.   c. nitrogen.   d. both oxygen and carbon dioxide . Oxygen transport in animals occurs by   a. diffusion.   b. convection.   c. active transport.   d. both convection and diffusion. _______ is the law that relates partial pressure and concentration in aqueous solutions.   a. The universal gas law   b. The partial pressure law   c. Henry’s law   d. Krogh’s law As a gas mixture or an aqueous solution flows, gas molecules in the gas or liquid are carried from place to place by   a. tidal flow.   b. diffusion.   c. evaporation.   d. convection. Which organisms use CO 2  during the day?   a. Fungi   b. Animals   c. Plants   d. Bacteria During gas diffusion, as the distance between  P 1  and  P 2  increases, the   a. rate of net movement decreases.   b. rate of net movement increases.   c. rate of net movement does not change.   d. diffusion coefficient increases. Consider two gas mixtures at the same temperature. If the concentration of CO 2  in Mixture A is 10 mmol/L and the concentration of CO 2  in Mixture B is 30 mmol/L, which statement is also true?   a. The partial pressure of CO 2  in Mixture B is 3 times as high as in Mixture A.   b. The partial pressure of CO 2  in Mixture B is 3 times lower compared to Mixture A.   c. The percent of CO 2  in Mixture B is 3 times as high as in Mixture A.   d. The percent of CO 2  is the same in both mixtures. Which statement regarding gas diffusion is true?   a. Gases diffuse only slightly faster through the gas phase than through aqueous solutions.   b. Gases diffuse many times faster through the gas phase than through aqueous solutions.   c. Gases diffuse at equal rates through the gas phase and aqueous solutions.   d. Gases diffuse only slightly slower through the gas phase than through aqueous solutions. If the partial pressures of nitrogen, argon, and CO 2  are 0.7808, 0.0093, and 0.0004 atm, respectively, in air at 1 atm, what is the partial pressure of the oxygen in this air?   a. 0.21%   b. 20.95%   c. 0.2095 atm   d. 20.95 atm At standard conditions of temperature and pressure (STP),   a. 1 mg of gas occupies 22.4 L.   b. 1 mole of gas occupies 22.4 L.   c. 22.4 moles of gas occupies 1 L.   d. 22.4 grams of gas occupies 1 L. Gases diffuse in net fashion from areas of relatively high partial pressure to areas of relatively low partial pressure   a. within gas mixtures.

BIO | 305 | Animal Physiology | assessment | Animal Physiology Fourth Editi

Week 7/8 Quiz (As long as you answer the queson, I don’t care if it’s bullet points or sentences) 1. How would you classify the following organism (gram result, organizaon, shape)? Posive, Cocci, Staph 2. Explain the diﬀerences between a Beta-Hemolyc organism and a Gamma-Hemolyc organism (what would you see on SBA and why). B=lyse blood, clear zone Y= do not lyse blood, red zone 3. Which media would you use to disnguish between two gram negave species? EMB 4. Which media would you use to disnguish between various Staph organisms? CAN or MSA or Catalase 5. Interpret the following results of an unknown organism (name the organism): Gram Stain: Posive Catalase: Negave Hemolysis: Alpha Optochin: Sensive Strep Pneumo

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