In the phenol broth red test (shown), a yellow color and bubble (as shown in the
ID: 133676 • Letter: I
Question
In the phenol broth red test (shown), a yellow color and bubble (as shown in the far left vial) indicate Bubble a. b. c. d. acidic fermentation products and gas production. acidic fermentation products and no gas production. fermentation of peptides to amines and gas production, fermentation of peptides to amines and no gas production. 9. Why does respiration yield more energy per glucose than fermentation? a. Fermentation uses more enzymes, and enzymes are costly to make. b. Fermentation requires oxygen. c. In fermentation the carbons in glucose do not become fully oxidized. d. Fermentation is only found in prokaryotic organisms; eukaryotes need more energy. 10. Which of the following plants can grow without fertilizer? a. plants with rhizobia symbionts b. plants that do not need proteins c. plants that do not need nucleic acids d. plants that can carry out the Calvin cycle 11. Which of the pathways below are in the correct order for the flow of electrons from glucose to oxygen in aerobic respiration? a. glycolysis, ETS, TCA b. glycolysis, fermentation, TCA TCA, glycolysis, ETS glycolysis, TCA, ETS c. d. 12. CASE HISTORY Shane, a 21-year-old college student, was spending spring break at the beach in Cancun, where he frequently ordered drinks from the beachfront stands. Upon his return to classes, Shane fellill with a fever of 38 °C (102° F, severe abdominal cramps, and watery diarrhea By the second day, Shane had blood in his stools, a condition known as dysentery. Upon admission to the hospital, Shane showed dehydration, and his rectal exam was very painful with bleedingExplanation / Answer
8] Option [A] Acidic fermentation products and gas formation
Phenol broth red test is used to study lactose fermentation in various bacteria. Phenol broth has a yellow colour in acidic medium and turns bright pink to red in colour as the medium turns basic. Since in the above experiment, the solution is yellow in colour, we can assume that fermentation is producing acidic substance. Bubbles in the solution indicate that gas [ most probably CO2 ] is also being produced.
9] Option [C] In fermentation, the carbon atoms in glucose do not become fully oxidised.
Fermentation is a process in which there is an incomplete breakdown of glucose to yield CO2 and alcohol due to lack of oxygen. In aerobic respiration, there is a complete breakdown of glucose to yield CO2, H2O and energy in the form of ATP.
10] Option [A] Plants with rhizobia symbionts
Rhizobium is a type of nitrogen-fixing bacteria which live in the root nodules of some plants, mostly legumes. These bacteria can fix atmospheric nitrogen into compounds which can be absorbed by the plants. In return, they absorb nutrients from those plants. Since the requirement for nitrogen is fulfilled with the help of the rhizobia, such plants do not need fertilisers.
11] Option [A] glycolysis, ETS, TCA
Glycolysis occurs in the cytoplasm of the cell where glucose is broken into two molecules of pyruvate.
ETS or electron transport system is a series of redox reactions which create an electron transport chain and help in the TCA or Tricarboxylic acid cycle resulting in the complete breakdown of glucose to yield CO2, H2O and energy in the form of ATP.
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