Homework Answers
B is the correct answer. The colour change is from red to no colour change. In this process nitrate and nitrite reducts.
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What are the color changes during this reaction? What is it testing for? ammonium NOZ NOZ...
Test interpretation: A. Addition of reagents A and B: color changed to redà nitrate reductase- positive...
Test interpretation:
A. Addition of reagents A and B: color changed to redà nitrate
reductase- positive (nitrate reducer). If this is the case, you are
done, do not add zinc powder.
B. Addition of reagents A and B: no color changeà it could be:
(a) nitrate reductase-negative (non-reducer) or (b) nitrate
reductase-positive (super reducer). ADD ZINC POWDER TO THE BROTH to
distinguish between these two possibilities.
1. If red color formsà nitrate is still present in the broth:
non- reducer....
From a farmer’s point of view who has agricultural crops, would it be better for a...
From a farmer’s point of view who has agricultural crops, would
it be better for a nitrate reducing bacteria in the soil to be a
denitrifier (denitrification) or a disassimilatory nitrate reducer
to ammonium (DNRA) and why?
Two dissimilatory nitrate reduction pathways: Denitrificatio Dissimilatory Nitrate Reduction to Ammonium (DNRA) NH,OH Hydroxyl amine NH, Ammonia Assimilatory nitrate reduction Although both processes are known to occur only one (denitrification has been thought to account for nearly all nitrate dissimilation in agricultural soils...
Questions: After adding Nitrate Reagent A and B, there was no red color change. You then...
Questions: After adding Nitrate Reagent A and B, there was no red color change. You then added a pinch of zinc powder with a formation of a red color. What category of nitrate reduction, would this microbe be? Explain how this red color change occurred? Denitrification part of the nitrogen cycle. Some microbes use this pathway anaerobically to convert nitrates (NO3- ) to nitrogen (N2) gas. Other bacteria in anaerobic conditions, use what is called a Dissimilatory nitrate reduction to...
Write the balanced chemical reaction for the following nitrogen cycle reactions. These reactions ...
Write the balanced chemical reaction for the following nitrogen cycle reactions. These reactions are mediated by bacteria and plants in nature and in wastewater treatment. (a) nitrification of ammonium to nitrite using molecular oxygen. (b) nitrification of nitrite to nitrate using molecular oxygen. (c) denitrification of nitrate to N2 using succinic acid as the carbon & energy source. (d) If a wastewater effluent has an ammonium concentration of 12 mg/L as N, what is the nitrogenous oxygen demand (how much...
You have obtained samples from a patient who is in the ICU at your hospital. You...
You have obtained samples from a patient who is in the ICU at your hospital. You perform the Gram-Stain and IMVIC tests, and see the following results: Gram-Stain Upon examination under the microscope you view pink colored rods. IMVIC Indole: After the addition of Kovac's Reagent, you see no color change at the top of the media. Methyl Red: After the addition of methyl red, your broth immediately turns a red color. Voges Proskauer: After the addition of VP reagents...
An aqueous ammonium nitrate battery might be designed as NH4ClaqjjN aNO3;aq. (a) What is the reactant...
An aqueous ammonium nitrate battery might be designed as NH4ClaqjjN aNO3;aq. (a) What is the reactant at the anode? (Hint: RED CAT) (b) At 25 oC in water, the saturation concentration of NH4Cl is 391.8 g/L and of N aNO3 is 91.2 g/100 mL. If the battery shown above is formed with the saturation concentrations in the 0.1000 liter volume of each half of the cell and the battery does not explode, what is the potential of the battery before...
4 Photos 6. A throat swab was obtained from a paticnt with Streptococcal pharyngitis What type...
4 Photos 6. A throat swab was obtained from a paticnt with Streptococcal pharyngitis What type of expected en blood agar from the throat culture th can be either A or C 17. The species of Streptococous that causes pharymgits or "Strep throa" is IS. The pll indicator used in sugr feementation tubes is a. Neutral red b. Methyl red e. None of the above 19. Kligler's Iron agar, bocause of its composition, can be usod fo which of dhe...
In the following reaction, describe what is likely to happen CaSiO3 + H2CO3 <==> CaCO3 +...
In the following reaction, describe what is likely to happen CaSiO3 + H2CO3 <==> CaCO3 + SiO2 + H2O + Heat 1. CaSiO3and H2CO3 will increase until a new equilibrium is reached 2. CaCO3 + SiO2 will increase until a new equilibrium is reached 3. There will be no change in reactants 4. CaSiO3 + H2CO3 will eventual be completely lost 5. CaCO3 + SiO2 will eventually be completely lost Entropy is the concept of the universe moving towards chaos!...
D e eest. Results are determined by one of two ways: Ord O Directly observe First...
D e eest. Results are determined by one of two ways: Ord O Directly observe First perform a chemical test using media for results OR reagents. THEN observe media for results For example read through Physical Factors: Atmospheric Oxygen Requirements. (you do not do this test for your unknown). Pene 04. 1 pt. What is it you are testing for with this test? This should be a general answer, not a list of the five types of metabolic pathways. Omnou...
Nitric oxide can be made from the reaction of oxygen and nitrogen gases. O2(g) + N2(g) → 2NO(g) If ΔG° = 165.5 kJ, and ΔH° = 180.4 kJ, what is ΔS° at 325°C? Select one: a. 0.142 kJ/K b. 1.02 kJ/K c. 0...
Nitric oxide can be made from the reaction of oxygen and nitrogen gases. O2(g) + N2(g) → 2NO(g) If ΔG° = 165.5 kJ, and ΔH° = 180.4 kJ, what is ΔS° at 325°C? Select one: a. 0.142 kJ/K b. 1.02 kJ/K c. 0.0125 kJ/K d. 0.0458 kJ/K e. 0.0249 kJ/K
Test interpretation:
A. Addition of reagents A and B: color changed to redà nitrate
reductase- positive (nitrate reducer). If this is the case, you are
done, do not add zinc powder.
B. Addition of reagents A and B: no color changeà it could be:
(a) nitrate reductase-negative (non-reducer) or (b) nitrate
reductase-positive (super reducer). ADD ZINC POWDER TO THE BROTH to
distinguish between these two possibilities.
1. If red color formsà nitrate is still present in the broth:
non- reducer....
From a farmer’s point of view who has agricultural crops, would
it be better for a nitrate reducing bacteria in the soil to be a
denitrifier (denitrification) or a disassimilatory nitrate reducer
to ammonium (DNRA) and why?
Two dissimilatory nitrate reduction pathways: Denitrificatio Dissimilatory Nitrate Reduction to Ammonium (DNRA) NH,OH Hydroxyl amine NH, Ammonia Assimilatory nitrate reduction Although both processes are known to occur only one (denitrification has been thought to account for nearly all nitrate dissimilation in agricultural soils...
You have obtained samples from a patient who is in the ICU at your hospital. You perform the Gram-Stain and IMVIC tests, and see the following results: Gram-Stain Upon examination under the microscope you view pink colored rods. IMVIC Indole: After the addition of Kovac's Reagent, you see no color change at the top of the media. Methyl Red: After the addition of methyl red, your broth immediately turns a red color. Voges Proskauer: After the addition of VP reagents...
4 Photos 6. A throat swab was obtained from a paticnt with Streptococcal pharyngitis What type of expected en blood agar from the throat culture th can be either A or C 17. The species of Streptococous that causes pharymgits or "Strep throa" is IS. The pll indicator used in sugr feementation tubes is a. Neutral red b. Methyl red e. None of the above 19. Kligler's Iron agar, bocause of its composition, can be usod fo which of dhe...
D e eest. Results are determined by one of two ways: Ord O Directly observe First perform a chemical test using media for results OR reagents. THEN observe media for results For example read through Physical Factors: Atmospheric Oxygen Requirements. (you do not do this test for your unknown). Pene 04. 1 pt. What is it you are testing for with this test? This should be a general answer, not a list of the five types of metabolic pathways. Omnou...
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