Food Biotechnology Mid Term Test

The reasons why microorganisms have played a major role in the development of biotechnology, except

• mass growth of microorganisms is possible

• cheap waste materials which act as the media for the growth of microorganisms can be rapidly grown

• there is massive diversity in the metabolic types gives diverse potential products

• results in the ease of genetic manipulation to improve strains for new products

• the production represents a significant risk

These are the environmental factors affecting bacterial growth

• energy

• solutes

• oxygen

• pH

• temperature

Temperature ranges of psychrophiles bacterial growth

• -5 until 30

• 10 until 47

• 40 until 110

Temperature ranges of mesophiles bacterial growth

• -5 until 30

• 10 until 47

• 40 until 110

Temperature ranges of thermophiles bacterial growth

• -5 until 30

• 10 until 47

• 40 until 110

The aim of strain improvement is

These are the function of microbes in food

• beneficial for fermented food production

• source of toxin and vector for pathogens

• food deterioration

• source of nutrients

• interacting medium

These are the differences between bacteria, yeast and mold

• bacteria reproduce through binary fission, yeast through budding, mold through spores

• bacteria, yeast and mold are used for food production

• bacteria cell wall is made up of murein, yeast cell wall is made up of chitin, mold cell wall is made up of cellulose

These are the similarities between bacteria, yeast and mold

• bacteria reproduce through binary fission, yeast through budding, mold through spores

• bacteria, yeast and mold are used for food production

• bacteria cell wall is made up of murein, yeast cell wall is made up of chitin, mold cell wall is made up of cellulose

These are the primary sources of microorganisms

• food handlers

• air and dust

• food utensils

• soil and water

• respiratory tract of human and animals