in which of the following does the fermentation by yeast occur course hero

What is microbial fermentation and why is it important?

Microbial fermentation processes have been manipulated by humans and are used extensively in the production of various foods and other commercial products, including pharmaceuticals. Microbial fermentation can also be useful for identifying microbes for diagnostic purposes.

What is a respirometer for yeast fermentation?

Yeast are able to ferment a variety of sugars in anaerobic conditions. Carbon dioxide is produced as a byproduct. A respirometer can be used to determine how much carbon dioxide is produced and thus measure rates of fermentation. Respirometers were set up that contained yeast and either a solution containing a carbohydrate or distilled water.

How did a student set up respirometers to measure fermentation of carbohydrates?

A student set up respirometers to measure fermentation of two different carbohydrates by yeast. He measured the height of the bubble (in mm) in each respirometer every 5 minutes for 20 minutes. His data can be seen in the table below. Which of the errors listed below could have caused him to get this result? A.

How do you measure fermentation of two different carbohydrates?

A student set up respirometers to measure fermentation of two different carbohydrates by yeast. He measured the height of the bubble (in mm) in each respirometer every 5 minutes for 20 minutes.

Which of the following does not occur during yeast fermentation?

Which of the following does NOT occur during yeast fermentation? Lactate is produced.

What is yeast fermentation?

Upon a strictly biochemical point of view, fermentation is a process of central metabolism in which an organism converts a carbohydrate, such as starch or sugar, into an alcohol or an acid. For example, yeast performs fermentation to obtain energy by converting sugar into alcohol.

What is the role of yeast in alcoholic fermentation?

The role of yeast in fermentation is that it reduces the pH level during fermentation. It also gives good quality such as texture, taste, nutritive values, odor, and functional properties of fermented products. It is used in fermented food either alone or with the association of other bacteria.

Does lactic acid fermentation produce a 3 carbon compound?

Lactic acid fermentation can occur in large muscles in the human body, while alcohol fermentation occurs in yeast and some bacteria. Lactic acid fermentation produces a 2-carbon compound, while alcohol fermentation produces a 3-carbon compound.

Where does yeast fermentation occur?

Fermentation occurs in yeast cells, and a form of fermentation takes place in bacteria and in the muscle cells of animals. In yeast cells (the yeast used for baking bread and producing alcoholic beverages), glucose can be metabolized through cellular respiration as in other cells.

Why does fermentation occur?

Fermentation is the process of sugars being broken down by enzymes of microorganisms in the absence of oxygen. Microorganisms such as bacteria and fungi have unique sets of metabolic genes, allowing them to produce enzymes to break down distinct types of sugar metabolites.

What can yeast ferment?

In addition to oxygen, they require a basic substrate such as sugar. Some yeasts can ferment sugars to alcohol and carbon dioxide in the absence of air but require oxygen for growth. They produce ethyl alcohol and carbon dioxide from simple sugars such as glucose and fructose.

Where does alcoholic fermentation occur?

cytosolIn the absence of oxygen, alcoholic fermentation occurs in the cytosol of yeast (Sablayrolles, 2009; Stanbury et al., 2013). Alcoholic fermentation begins with the breakdown of sugars by yeasts to form pyruvate molecules, which is also known as glycolysis.

What are the products of fermentation in yeast?

In yeasts, fermentation results in the production of ethanol and carbon dioxide – which can be used in food processing: Bread – Carbon dioxide causes dough to rise (leavening), the ethanol evaporates during baking.

Where does lactic acid fermentation occur?

Lactic acid fermentation occurs in the skeletal muscles. When oxygen is inadequate, pyruvate is converted to lactic acid by lactate dehydrogenase. It results in the accumulation of lactic acid and muscle fatigue.

Which of the following occurs in lactic acid fermentation?

Lactic acid fermentation creates ATP, which is a molecule both animals and bacteria need for energy, when there is no oxygen present. This process breaks down glucose into two lactate molecules. Then, lactate and hydrogen form lactic acid.

Does yeast produce lactic acid during fermentation?

Yeasts, such as Saccharomyces cerevisiae (bakers yeast) offer themselves as production organisms because they can tolerate low pH and grow on mineral media. However, yeasts do not produce lactic acid naturally. Metabolic engineering allows the exchange of ethanol with lactic acid as end product of fermentation (Fig.

What is the method of fermentation?

Fermentation is an enzyme catalysed, metabolic process whereby organisms convert starch or sugar to alcohol or an acid anaerobically releasing energy. The science of fermentation is called “zymology”.

How does yeast fermentation work in bread?

During fermentation, carbon dioxide is produced and trapped as tiny pockets of air within the dough. This causes it to rise. During baking the carbon dioxide expands and causes the bread to rise further. The alcohol produced during fermentation evaporates during the bread baking process.

What is the function of respirometer in yeast?

Carbon dioxide is produced as a byproduct. A respirometer can be used to determine how much carbon dioxide is produced and thus measure rates of fermentation.

What was added to the test tubes to absorb carbon dioxide?

He forgot to add the yeast. A cotton ball with 15% potassium hydroxide, which absorbs excess carbon dioxide, was added to three different test tubes. On top of the cotton ball, an equal weight of either glass beads, germinating seeds, or non-germinating seeds was placed.