A common concern for beer brewers making sour beers is contamination from Acetobacter. This organism converts ethanol to acetic
acid and gives the finished product an undesirable vinegar flavor. Which of the following media would serve as a good enrichment medium to detect the presence of Acetobacter in a brewery environment? a. Carbon dioxide, yeast extract, trace elements
b. Cellulose, phosphate buffer, magnesium sulfate, calcium chloride, trace elements
c. Ethanol, ammonium chloride, phosphate buffer, magnesium sulfate, calcium chloride, trace elements
d. Glucose, ammonium chloride, phosphate buffer, magnesium sulfate, calcium chloride, trace elements
C. Ethanol, ammonium chloride, phosphate buffer, magnesium sulfate, calcium chloride, trace elements
Explanation:
Acetobacter must have a sufficient supply of oxygen and cannot grow in its absence. Colonies of acetobacter can be detected by a culture media containing ethanol as carbon source, the acid produce by the bacteria will dissolve the chalk thereby leaving a clear zone around the colony.
Acetobacter is an acetic acid bacteria that convert ethanol to acetic acid in the presence of oxygen. This bacteria oxidize lactate and acetate into carbon dioxide and water. Acetic acid bacteria are found in media that have high concentration of carbohydrates like fruits and ethanol. Acetobacters are found in fermented foods. Ethanol, ammonium chloride, magnesium sulfate, calcium chloride, phosphate buffer and trace elements are good enrichment media for acetobacters growth because of high concentration of sugar.
Parenchyma has a thin cell wall of their cells, and are made up of cellulose. Whereas collenchyma cells have an uneven cell wall made up of pectin and hemicellulose. There is a hard and thick cell wall present of the sclerenchyma cells, which is made up of the lignin.
The muscle has two, three, or four origins, respectively.
Explanation
A muscle is an organ composed of muscle tissue that contract to facilitate a particular movement
biceps,triceps and quadriceps are types of skeletal muscles since they use bones as levers
<em><u>They differ in that; the biceps have two origins, triceps have three origins and quadriceps have four origin.</u></em>
<em><u>Bicep is a two headed muscle thus said to have two origins ,triceps have three muscle heads and therefore have three separate origin attachment point while quadriceps are made of four muscles heads hence have four origins. </u></em>
