Homework Answers
Answer is option 3.
In nitrate reduction test nitrate is reduced to nitrite by the enzyme nitrate reductase. Denitrifying bacteria are able to reduce nitrate into nitrite and further reduction of nitrite into ammonia. So, in nitrate reduction test nitrate receives electrons.
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If a bacterial species is positive in nitrate reduction test, which one of the following best...
Test Purpose Reagents Observation Results Gram To determines the identify the bacteria as a gram positive...
Test Purpose Reagents Observation Results Gram To determines the identify the bacteria as a gram positive or a gram negative. Crystal violet, iodine, Alcohol ,safranin Pink rods Gram negative rods Oxidase To determine the presence of cytochrome oxidase enzyme . Oxidase paper Lactose To determine if the bacteria can ferment carbohydrate . None Indole Test To determine the bacteria’s ability to decompose amino acid tryptophane to indole. Kovac added to1ml of trypotone broth Optimum Temp To determine the bacteria’s ability...
27) Which one of the following best describes the electron transport chain? A) Electrons are passed...
27) Which one of the following best describes the electron transport chain? A) Electrons are passed from one carrier to another releasing a little energy at each B) Hydrogen atoms are added to CO2 to make an energy-rich compound. C) Electrons are pumped across a membrane by active transport. D) Glucose is broken down to a three-carbon compound 28) After completion of the citric acid cycle, most of the usable energy from the one molecule is in the form of...
Is it possible a bacterium that can only grow at the bottom of a tube of...
Is it possible a bacterium that can only grow at the bottom of a tube of thioglycolate broth is also oxidase-positive? Why, or why not? Select one: O a. Yes, it is absolutely possible. This bacterium is facultative anaerobic, so it uses oxidase to ferment glucose. O b. No, it is not possible. It is an obligate anaerobe, and has no reason to have enzymes needed for aerobic respiration. O c. No, it is not possible. It can only use...
Is it possible a bacterium that can only grow at the bottom of a tube of...
Is it possible a bacterium that can only grow at the bottom of a tube of thioglycolate broth is also oxidase- positive? Why, or why not? Select one: a. Yes, it is absolutely possible. This bacterium is facultative anaerobic, so it uses oxidase to ferment glucose. b. No, it is not possible. It is an obligate anaerobe, and has no reason to have enzymes needed for aerobic respiration. O c. No, it is not possible. It can only use fermentation...
this are very difficult questions for my environmental biology class. These are examples from the practice...
this are very difficult questions for my environmental biology
class. These are examples from the practice homework so can anyone
please help me check my answers.
-) The temperature classes of microorganisms are based on optimum temperatures of microbi A) cell wall C) cell membrane B) enzymes D) All of the above 20) Aerobic respiration, anaerobic respiration, and fermentation are all pathways of which involve the of nutrients. A) Catabolism, reduction B) Anabolism; oxidation C) Catabolism; oxidation D) Anabolism, reduction...
BIOL2516K Spring 2020 Week 9 Results and Homework Name 2. What does the oxidase test determine?...
BIOL2516K Spring 2020 Week 9 Results and Homework Name 2. What does the oxidase test determine? Would you expect positive results in both aerobic and anaerobic species? 3. You accidentally mixed up the labeling of 2 pure cultures you incubated overnight. One is a Staphylococcus species and the other is a Streptococcus species. What could you do to identify the 2 tubes? Staphylococcus species are facultative anaerobes and Streptococcus species are aerotolerant anaerobes could you do to identibus species and...
help please What type(s) of bacteria are favored to grow on eosin methylene blue (EMB) agar?...
help please
What type(s) of bacteria are favored to grow on eosin methylene blue (EMB) agar? Select one: O a Gram positive bacteria that can undergo anaerobic respiration. O b. Gram negative bacteria that can ferment glucose and/ or lactose, O c. Only those bacilli that can utilize citrate as a main carbohydrate source. O d. All Bacteria would grow equally well A bacterial species grows on a MacConkey agar plate, and the colonies have dark red color with hazy...
help please In a urea broth test, a bacterial species is tested positively. This bacterium must...
help please
In a urea broth test, a bacterial species is tested positively. This bacterium must be able to: Select one: O a. absorb urea as a main source of nitrogen and carbon O b. turn the urea broth from red to bright yellow (acidic). O c. release urease as an exoenzyme. O d. digest proteins and release urea as a waste product. Which of these tests is positive før H2S and which is positive for Indole? Select one: O...
Please answer all... Thank you! 45) Which of the following is true of cyclic photophosphorylation? (1...
Please answer all... Thank you!
45) Which of the following is true of cyclic photophosphorylation? (1 pts) Water is split to produce oxygen. NADP+ is reduced directly at the end of a liner O-R system. Electrons emitted during radiant excitation of bacteriochlorophylls are retunred through a cyclic O-R system O None of the above are correct. 46) Which of the following is true of the glycolytic pathway? (1 pts) The pathway begins with glucose. The pathway ends with pyruvate. The...
Question 1 The rate-limiting, or slowest, step in the methanogenic biodegradation of solid substrates, such as...
Question 1 The rate-limiting, or slowest, step in the methanogenic biodegradation of solid substrates, such as organic wastes and animal manures is: Answers: a. Methanogenesis b. Fermentation c. Respiration d. Hydrolysis e. Photosynthesis Question 2 Methanotrophic bacteria: Answers: a. oxidise methane to produce carbon dioxide b. produce methane by photosynthesis c. are found mainly in aquatic environments d. are strictly anaerobic bacteria e. produce methane by oxidation of organic compounds Question 3 Decomposition is mainly driven by: Answers: a. Algae...
27) Which one of the following best describes the electron transport chain? A) Electrons are passed from one carrier to another releasing a little energy at each B) Hydrogen atoms are added to CO2 to make an energy-rich compound. C) Electrons are pumped across a membrane by active transport. D) Glucose is broken down to a three-carbon compound 28) After completion of the citric acid cycle, most of the usable energy from the one molecule is in the form of...
Is it possible a bacterium that can only grow at the bottom of a tube of thioglycolate broth is also oxidase-positive? Why, or why not? Select one: O a. Yes, it is absolutely possible. This bacterium is facultative anaerobic, so it uses oxidase to ferment glucose. O b. No, it is not possible. It is an obligate anaerobe, and has no reason to have enzymes needed for aerobic respiration. O c. No, it is not possible. It can only use...
Is it possible a bacterium that can only grow at the bottom of a tube of thioglycolate broth is also oxidase- positive? Why, or why not? Select one: a. Yes, it is absolutely possible. This bacterium is facultative anaerobic, so it uses oxidase to ferment glucose. b. No, it is not possible. It is an obligate anaerobe, and has no reason to have enzymes needed for aerobic respiration. O c. No, it is not possible. It can only use fermentation...
this are very difficult questions for my environmental biology
class. These are examples from the practice homework so can anyone
please help me check my answers.
-) The temperature classes of microorganisms are based on optimum temperatures of microbi A) cell wall C) cell membrane B) enzymes D) All of the above 20) Aerobic respiration, anaerobic respiration, and fermentation are all pathways of which involve the of nutrients. A) Catabolism, reduction B) Anabolism; oxidation C) Catabolism; oxidation D) Anabolism, reduction...
BIOL2516K Spring 2020 Week 9 Results and Homework Name 2. What does the oxidase test determine? Would you expect positive results in both aerobic and anaerobic species? 3. You accidentally mixed up the labeling of 2 pure cultures you incubated overnight. One is a Staphylococcus species and the other is a Streptococcus species. What could you do to identify the 2 tubes? Staphylococcus species are facultative anaerobes and Streptococcus species are aerotolerant anaerobes could you do to identibus species and...
help please
What type(s) of bacteria are favored to grow on eosin methylene blue (EMB) agar? Select one: O a Gram positive bacteria that can undergo anaerobic respiration. O b. Gram negative bacteria that can ferment glucose and/ or lactose, O c. Only those bacilli that can utilize citrate as a main carbohydrate source. O d. All Bacteria would grow equally well A bacterial species grows on a MacConkey agar plate, and the colonies have dark red color with hazy...
help please
In a urea broth test, a bacterial species is tested positively. This bacterium must be able to: Select one: O a. absorb urea as a main source of nitrogen and carbon O b. turn the urea broth from red to bright yellow (acidic). O c. release urease as an exoenzyme. O d. digest proteins and release urea as a waste product. Which of these tests is positive før H2S and which is positive for Indole? Select one: O...
Please answer all... Thank you!
45) Which of the following is true of cyclic photophosphorylation? (1 pts) Water is split to produce oxygen. NADP+ is reduced directly at the end of a liner O-R system. Electrons emitted during radiant excitation of bacteriochlorophylls are retunred through a cyclic O-R system O None of the above are correct. 46) Which of the following is true of the glycolytic pathway? (1 pts) The pathway begins with glucose. The pathway ends with pyruvate. The...
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