Microorganisms in Food Production

Carbon dioxide is a gas, and its production during the chemical reaction between vinegar and the eggshell is visible as bubbles forming on the surface of the egg. The other options describe temperature changes or physical hardening, which are not direct evidence of gas production.

The synthesis of pharmaceuticals, plastics, and other synthetic materials in the chemical industry relies on chemical reactions to transform raw materials into new substances.

Mold is a type of multicellular fungus that grows in the form of multicellular filaments called hyphae, commonly found on decaying food. Bacteria are single-celled microorganisms, not fungi.

Yeast is a single-celled fungus that ferments sugars in the dough, producing carbon dioxide gas. This gas gets trapped in the dough, causing it to rise and become light and airy.

Bacteria, specifically lactic acid bacteria like Lactobacillus, ferment the lactose in milk into lactic acid. This acid lowers the pH, causing the milk proteins to coagulate and thicken into yogurt. Yeast, algae, and phytoplankton do not perform this specific fermentation process for yogurt production.

The rumen acts as a large fermentation vat where billions of bacteria and protozoa break down complex plant fibers like cellulose. Other compartments like the reticulum, omasum, and abomasum serve different roles in filtration, water absorption, and enzymatic digestion.

Fermentation is a metabolic process that converts sugar to acids, gases, or alcohol. Both pyruvate decarboxylase (used in alcoholic fermentation) and alcohol dehydrogenase are key enzymes involved in these pathways.

Anaerobic respiration occurs in the absence of oxygen. Oxygen is a reactant in aerobic respiration, not a product of anaerobic processes.

Wine and beer are produced by fermentation without distillation, whereas whisky, rum, and brandy are produced by distillation of fermented broths.

The large holes in Swiss cheese are caused by the production of a large amount of carbon dioxide by the bacterium Propionibacterium sharmanii during the ripening process.

Leuconostoc species are commonly involved in the fermentation of various food products, including those made from legumes like Bengal gram.

Aspergillus niger is a fungus widely used in industrial biotechnology for the large-scale production of citric acid through fermentation processes.

Streptokinase is an enzyme produced by certain strains of Streptococcus bacteria. It is used medically to dissolve blood clots in patients suffering from myocardial infarction.

Acetic acid (vinegar) is produced through the oxidation of ethanol by bacteria of the genus Acetobacter.