In a eukaryotic cell, which of the following correctly identifies the precise sub-cellular locations for the three main stages of aerobic cellular respiration?

Glycolysis occurs in the cytosol, the Krebs cycle occurs in the mitochondrial matrix, and the Electron Transport Chain (ETC) occurs in the inner mitochondrial membrane.

Glycolysis occurs in the cytosol, the Krebs cycle occurs in the mitochondrial intermembrane space, and the ETC occurs in the mitochondrial matrix.

Glycolysis occurs in the mitochondrial matrix, the Krebs cycle occurs in the cytosol, and the ETC occurs in the outer mitochondrial membrane.

Glycolysis occurs in the inner mitochondrial membrane, the Krebs cycle occurs in the cytosol, and the ETC occurs in the mitochondrial matrix.

If a researcher observes that the pH of the mitochondrial intermembrane space is significantly lower than that of the mitochondrial matrix, which stage of cellular respiration is primarily responsible for generating this gradient, and where are the proteins located that perform this work?

The Electron Transport Chain, located in the inner mitochondrial membrane.

The Link Reaction, located in the outer mitochondrial membrane.

Glycolysis, located in the cytosol.

The Krebs cycle, located in the mitochondrial matrix.

During a laboratory experiment, a student isolates an enzyme that facilitates the decarboxylation of citrate. In which specific location of a eukaryotic cell would this enzyme naturally be found, and which metabolic pathway is it a part of?

Mitochondrial matrix; Krebs cycle

Inner mitochondrial membrane; Electron Transport Chain

Intermembrane space; Oxidative phosphorylation

Which of the following describes the correct spatial relationship between the location of the Krebs cycle and the Electron Transport Chain (ETC) within a mitochondrion?

The Krebs cycle occurs in the fluid-filled matrix, while the ETC is embedded in the surrounding cristae.

The Krebs cycle occurs in the cytosol, while the ETC is located in the mitochondrial matrix.

The Krebs cycle occurs in the intermembrane space, while the ETC is embedded in the outer membrane.

The Krebs cycle occurs in the cristae, while the ETC is located in the intermembrane space.

A metabolic toxin is discovered that specifically inhibits the enzymes responsible for the synthesis of pyruvate. In which specific cellular compartment would this toxin exert its primary effect, and which subsequent stage of cellular respiration would be most immediately deprived of its substrate?

The toxin would act in the cytosol, and the Krebs cycle would be deprived of its substrate.

The toxin would act in the intermembrane space, and the Link Reaction would be deprived of its substrate.

The toxin would act in the mitochondrial matrix, and glycolysis would be deprived of its substrate.

The toxin would act in the inner mitochondrial membrane, and the Electron Transport Chain would be deprived of its substrate.

In an experiment investigating the energetics of cellular respiration, a student tracks a molecule of FADH_{2} from its point of origin to its point of utilization. In which specific locations within a eukaryotic cell would these two events occur, respectively?

Mitochondrial matrix and inner mitochondrial membrane

Cytosol and mitochondrial matrix

Inner mitochondrial membrane and mitochondrial matrix

Mitochondrial matrix and intermembrane space

If a eukaryotic cell were treated with a fluorescent dye that only labels enzymes found in the cytosol, which of the following stages of cellular respiration would show fluorescence, and where would the dye be absent for the remaining stages?

Glycolysis would show fluorescence; the dye would be absent from the mitochondrial matrix and inner mitochondrial membrane.

Glycolysis and the Krebs cycle would show fluorescence; the dye would be absent from the inner mitochondrial membrane.

The Electron Transport Chain would show fluorescence; the dye would be absent from the mitochondrial matrix and cytosol.

The Krebs cycle would show fluorescence; the dye would be absent from the cytosol and intermembrane space.

An experimental drug is found to create tiny pores in the inner mitochondrial membrane, allowing protons to leak freely across. While this directly interferes with the Electron Transport Chain's ability to maintain a gradient, which of the following describes the correct spatial origin of the high-energy electron carriers ( NADH and FADH_{2} ) that normally power the ETC, and where are they utilized?

They are primarily produced in the mitochondrial matrix and utilized at the inner mitochondrial membrane.

They are primarily produced in the intermembrane space and utilized in the cytosol.

They are primarily produced in the cytosol and utilized in the mitochondrial matrix.

They are primarily produced in the mitochondrial matrix and utilized in the outer mitochondrial membrane.

In a eukaryotic cell, the conversion of NAD^{+} to NADH occurs in several locations. If a researcher captures a snapshot of cellular respiration and finds NADH being produced specifically within the mitochondrial matrix, which stage of respiration is being observed and where will this NADH be utilized next?

The Krebs cycle is being observed, and the NADH will be used at the inner mitochondrial membrane.

Glycolysis is being observed, and the NADH will be used in the cytosol.

The Electron Transport Chain is being observed, and the NADH will be used in the intermembrane space.

The Link reaction is being observed, and the NADH will be used in the outer mitochondrial membrane.

If a biologist isolates the enzymes of the Krebs cycle and the proteins of the Electron Transport Chain (ETC), in which two specific mitochondrial compartments were these components originally located?

The Krebs cycle enzymes were in the matrix, while the ETC proteins were in the inner membrane.

The Krebs cycle enzymes were in the cytosol, while the ETC proteins were in the matrix.

The Krebs cycle enzymes were in the intermembrane space, while the ETC proteins were in the outer membrane.

The Krebs cycle enzymes were in the inner membrane, while the ETC proteins were in the matrix.

Identify where glycolysis, Krebs cycle, and ETC occur

LESSON 4. Cellular Respiration • Define cellular respiration • Identify the stages of clan respiration You have just learned how the energy from the sun is captured, processed, and stored in the form of glucose. Cellular respiration, another important life process, is the means by which cells release the stored energy in glucose to make adenosine triphosphate (ATP). The primary goal of this life process is to convert stored energy into usable form, such as ATP, for the cells to carry out their functions. Cellular respiration involves several chemical reactions. The reactions can be summed up in the following equation: C6 H12 O6 + 602 ----- 6 CO₂ +6H₂O + ATP Glucose oxygen carbon dioxide water energy Aerobic respiration reactions, or cellular respiration that takes place in the presence of oxygen, can be grouped into three stages glycolysis, Krebs cycle, and electron transport chain (ETC). Stage 1: Glycolysis Glycolysis is the process that breaks down one molecule of 6-C glucose into 3-C pyruvates or pyruvic acids. It also releases four molecules of ATP. This process occurs in the cytoplasm of the cell. The following is the step-by-step process of glycolysis. Take note that several enzymes are involved in this process. 1. The first step of glycolysis requires energy. It can only proceed when the two ATP molecules donate energy to the glucose by transferring a phosphate group with the help of an enzyme, producing glucose 6-phosphate 2. Then, a specific enzyme promotes the rearrangement of the atoms, producing the fructose 6-phosphate. 3. The action of the enzyme in step 2 promotes the transfer of a phosphate group from another ATP molecule, forming fructose 1,6-bisphosphate. 4. The resulting fructose 1,6-bisphosphate molecules, with the help of another enzyme, splits into two molecules, each with three carbon backbones. These two sugars are dihydroxyacetone phosphate and glyceraldehyde 3-phosphate. 5. Another important enzyme then rapidly interconverts the molecules of dihydro-xyacetone phosphate and glyceraldehyde 3-phosphate. This produces two molecules of glyceraldehyde 3-phosphate or 3-phosphoglyceraldehyde (PGAL) 6. The succeeding step involves another enzyme-mediated action. The hydrogen (H) from PGAL is transferred to the oxidizing agent, nicotinamide adenine dinucleotide (NAD), which forms NADH. A phosphate (P) is also added from the cytosol of the cell to oxidize the two molecules of PGAL, forming two 1.3-bisphosphoglycerate. 7. A phosphate (P) from 1,3-biphosphoglycerate is transferred to ADP to form ATP. This happens for each of the two 1,3-bisphosphoglycerate. resulting to a yield of two ATP and two 3-phosphoglycerate molecules. 8. A phosphate is transferred from 3-phosphoglycerate molecules from the third carbon to the second carbon, forming 2-phosphoglycerate molecules A hydrogen atom and a hydroxyl ((OH) group is released, which then combines to form water (H2O). The removal of H2O from 2-phosphoglycerate results in the formation of 2- phosphoglycerate molecules. 9. A hydrogen atom and a hydroxyl ((OH) group is released, which then combines to form water (H2O). The removal of H2O from 2-phosphoglycerate results in the formation of two phosphoenolpyruvic acid (PEP) 10. Phosphate (P) from PEP is transferred to ADP (and forms ATP) and the final product, pyruvic acid. This reaction yields two molecules of pyruvic acid and two ATP molecules In summary, a single glucose molecule that undergoes the process of glycolysis produces two molecules of pyruvic acid, four molecules of ATP, two molecules of NADEL and two molecules of H.O. However, only two molecules of ATP are counted as net products since two molecules of ATP are spent throughout the process. Stage II: Krebs Cycle The Krebs cycle, named after its proponent Sir Hans Adolf Krebs, is a cyclical series of enzyme-controlled reactions. This stage of cellular respiration occurs in the matrix of the mitochondria. It is sometimes. called the citric acid cycle (CAC) since it produces citric acid. Citric acid contains three carboxyl (COOH) groups; hence, it is also called the tricarboxylic acid cycle (TCA). This requires the pyruvic acids produced during glycolysis. The main function of this cycle is to produce high-energy-yielding molecules, namely, NADH and flavin adenine dinucleotide (FADH) that will later on be used in the electron transport chain reaction. Figure 6-7. Summary of glycolysis and corresponding products in each reaction presented (See Appendix F on page 285 for an enlarged and complete version of the image.) An initial process is needed for the Krebs cycle to begin. As a pyruvate molecule from glycolysis enters the mitochondrion, it undergoes an important preliminary ate to form acetyl-CoA reaction. Coenzyme-A (COA) combines with pyruvate help of an enzymatic complex. This conversion also produces CO, and NADH. The Krebs cycle is summarized as follows. Take note that several enzymes are involved in this process. 1. The Krebs cycle technically begins when the acetyl-CoA combines with oxaloacetic acid (OAA), a 4-C molecule, to produce citric acid, a 6-C molecule. 2. With the aid of an enzyme, the citric acid now goes through a series of reactions that releases energy. Water molecule is removed from the citric acid and is returned in a different location. The-OH group is repositioned, forming the molecule isocitrate. 3. Isocitrate is then oxidized, forming the a-ketoglutarate, a 5-C molecule. The byproducts of this reaction are NADH and CO, 4 The a-ketoglutarate loses its CO, and a coenzyme-A is added in its place. The decarboxylation occurs with the help of NAD, which then becomes NADH. The resulting molecule is called succinyl-CoA. 5. Succinyl-CoA is converted into succinate. Also in this reaction, a molecule of guanosine triphosphate (GTP) is synthesized. The GTP molecule has similar structure and energy properties to that of ATP and is used by cells the same way. The free phosphate group attacks the succinyl-CoA molecule, which detaches the COA. Then, phosphate is attached to GDP to come up with GTP, similar to the process that occur in ATP synthesis (from ADP to ATP). 6. Two hydrogens are removed from succinate, A molecule of flavin adenine dinucleotide (FAD), a coenzyme similar to NAD, is reduced to FADH, as it takes the hydrogens from the succinate. This reaction produces the fumarate. 7. Fumarate is then converted into malate as the addition of a water molecule is catalyzed. The final reaction is the regeneration of oxaloacetate. The resulting byproduct of this regeneration is NADH Recall that two pyruvate molecules were produced during glycolysis, causing the Krebs cycle to turn twice. Each tuts produces three molecules of NADH, single ATH one FADIH, and the by-product CO, which is exhaled. Stage III: Electron Transport Chain The electron transport chain (ETC) is a series of photon pumps on the inner membrane of the mitochondrion. Electron transport is the last stage of the cellular respiration. In this stage, the energy from NADH and FADH, from the Krebs cycle is transferred to ADP to produce ATP. This process is generally known as oxidative phosphorylation. This energy coupling mechanism in the cell was revealed by the work of Peter stored energy in the form of proton (1) gradient to phosphorylate (add phosphate) ADP and produce ATP. The pumping of hydrogen sons across the inner membrane creates higher concentration ions in the inner membrane than on the outside of the membrane. This chemiosmotic gradient causes the ions to flow back across the membrane where the concentration of ions is lower. ATP synthase lined in the matrix serve as a channel protein, helping the ions to move across the membrane. The chemiosmotic gradient powers the phosphorylation of ADP to ATP, which also occurs in the ATP synthase. After passing through the ETC, the oxygen, being the final hydrogen acceptor, combines with two electrons and two protons, forming a water molecule. Water is a by-product of cellular respiration and is excreted. MINI TEST 6-3 1. Which energy-releasing pathway yields the most ATF in each glucose molecule? 2. Briefly describe the two stages of aerobic respiration that follow glycolysis: (a) Krebs cycle (b) Electron transport chain Anaerobic Respiration Most cells carry out arrobic respiration when oxygen is present. Aerobic respiration is an efficient process that yields a lot of ATP. However, many organisms thrive in mud, marshes, animal gut, canned goods, sewage treatment pond, and deep oceans where oxygen is scarce. Organisms that can live without oxygen are called anaerobes. Cellular respiration that proceeds without the presence of oxygen is called anaerobic respiration. In the event that the oxygen supply becomes low, aerobic cells also perform fermentation and lactic acid fermentation anaerobic pathways. There are two common anaerobic pathways in these cells, alcoholic fermentation and lactic acid fermentation. In alcoholic fermentation, ethyl alcohol and carbon dioxide are produced by some cells using the pyruvate from glycolysis. Each pyruvate molecule is rearranged into acetaldehyde and carbon dioxide, which is eventually released. NADII gives up electrons to acetaldehyde to form ethanol Fermentation is widely used in the industry. Yeast, a fungus used in making bread. can undergo anaerobic respiration. Bakers aux sugar, flour, water, and yeast to form the bread dough. The dough rises due to the carbon dioxide and alcohol released by the yeast cells trapped in air bubbles. Beer and wine manufacturers, we yeast to ferment the sugars in wheat and grape juice, forming alcoholic beverages such as beer and wine. In some cells, glycolysis produces two pyruvates, two NADH molecules, and two ATP molecules. Pyruvate itself becomes the final acceptor of the electrons from the NADH that produces the final product: lactate. Oftentimes, this product is called lactic acid. Human skeletal muscles can carry out fermentation when the blood cannot supply the cells with adequate oxygen during strenuous activities. When lactic acid builds up in the muscles, fatigue, burning sensation, and cramps result. Lactic acid will continue to build up until there is adequate supply of oxygen. Lactic acid is then converted back into pyruvate in the liver. Muscles also restore normal functions. Have you ever wondered why milk or cream turns sour after some time? Bacterial cells that undergo fermentation are responsible in producing lactate that turns the milk sour. These bacteria are used in manufacturing yogurt and sour milk products. Fermentation pathways do not breakdown and utilize the glucose completely. ATP is no longer produced beyond the process of glycolysis. Thus, energy produced is just enough for some single-celled organisms, or the energy can only be used by multicellular organisms for a short period.

Identify where CO₂ is released in respiration

identify where water is found on Earth and that it can be solid or liquid.

1.1 Implement the business plan; 1.2 Operate the business; 1.3 Sell the product/service to potential customers; 1.4 Identify the reasons for keeping business records; 1.5 Perform key bookkeeping tasks; 1.6 Interpret financial statements (balance sheet, income statement, cash flow projections, and summary of sales and cash receipts); 1.7 Prepare an income statement and a balance sheet; 1.8 Identify where there is a profit or loss for a business; and 1.9 Generate an overall report on the activity. entrepreneurship grade 12

AA-SC.6.P.11.1 (M) - Explore the Law of Conservation of Energy by differentiating between potential and kinetic energy. Identify situations where kinetic energy is transformed into potential energy and vice versa.

SC.6.P.11.1 - Explore the Law of Conservation of Energy by differentiating between potential and kinetic energy. Identify situations where kinetic energy is transformed into potential energy and vice versa.

Identify the tone and mood using this stimulus "Dazzled by so many and such marvellous inventions, the people of Macondo did not know where their amazement began. They stayed up all night looking at the pale electric bulbs fed by the plant that Aureliano Triste had brought back when the train made its second trip, and it took time and effort for them to grow accustomed to its obsessive toom-toom. They became indignant over the living images that the prosperous merchant Don Bruno Crespi projected in the theatre with the lion-head ticket windows, for a character who had died and was buried in one film, and for whose misfortune tears of affliction had been shed, would reappear alive and transformed into an Arab in the next one. The audience, who paid two centavos apiece to share the difficulties of the actors, would not tolerate that outlandish fraud and they broke up the seats. The mayor, at the urging of Don Bruno Crespi, explained by means of a proclamation that the cinema was a machine of illusions that did not merit the emotional outburst of the audience. With that discouraging explanation many felt that they had been the victims of some new and showy gypsy business and they decided not to return to the movies, considering that they already had too many troubles of their own to weep over the acted-out misfortunes of imaginary beings."

Create a quiz where students have to recognize exposition, conflict, rising action, climax, falling action and resolution as well as identify author's purpose. Passages should be about motivation and integrity.

Related quizzes

Related quizzes