Compare and contrast refrigeration, pickling (packing in brine, or salt water),

Question

Compare and contrast refrigeration, pickling (packing in brine, or salt water), and benzoic acid (a preservative) and their effects on food. Continued on the next page.

a. Which of the above is not used to control growth of microbes in bread?

b. Which controls microbial growth in food by lowering the pH?

c. Which controls microbial growth in food by drawing water out of cells (the purpose of the

technique)?

d. Which of the above might control the growth of mesophiles?

Indicate whether the following statement applies to phototrophs, lithotrophs or heterotrophs. If the statement applies to more than one...

__________________ the organisms that use nitrogen, phosphorus, or sulfur as energy sources

are this type of organism (important for cycling these substances through the environment)

__________________ algae are this type of organism

__________________ these might be aerobes

__________________ these might live in, or on, soil

__________________ an organism classified as a detrivore (decomposer of dead organisms) is this type of organism

__________________Euglena could be placed in two of these categories. Which are they?

Indicate whether the following statements are true or false.

_____________________ Bacteria always grow in pure culture in nature.

_____________________ Both prokaryotes and eukaryotes have phospholipid cell membranes.

_____________________ Anaerobes can live in the human body.

_____________________ Eukaryotes have DNA but prokaryotes do not.

Explanation / Answer

a. Refrigeration is not used to control microbes in bread.

b. Benzoic acid control bacterial growth by lowering ph.

c. Pickling or salt water draws water out of cells

d. Refrigeration control growth of mesophiles..

Related Questions

Navigate

• Browse (All)
• Browse C
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.