MICROBIOLOGY: AN INTRODUCTION CHAPTER 29 EXAM PREP QUESTIONS AND ANSWERS FULLY VERIFIED

MICROBIOLOGY: AN INTRODUCTION
CHAPTER 29 EXAM PREP QUESTIONS AND
ANSWERS FULLY VERIFIED

◉ Chemical requirements for microbial growth.
Answer: carbon, nitrogen, sulfur, phosphorus, trace elements,
oxygen, organic growth factors


◉ pyschrophiles.
Answer: cold-loving microbes


◉ mesophiles.
Answer: moderate temperature loving microbes


◉ thermophiles.
Answer: heat-loving microbes. Optimum growth temperature of 50°
to 60°. Found in hot springs and organic compost.


◉ psychrotrophs.
Answer: Grow between 0°C and 20-30°C.
Cause food spoilage

,◉ Hyperthermophiles.
Answer: Optimum growth temperature > 80°C


◉ Most bactera grow between (pH).
Answer: pH 6.5 and 7.5


◉ Molds and yeasts grow between (pH).
Answer: pH 5 and 6


◉ Acidophiles grow in.
Answer: acidic environments


◉ Hypertonic enviroments (higher in solutes that inside the cell)
cause cause.
Answer: plasmolysis (due to high osmotic pressure)


◉ Extreme or obligate halophiles require.
Answer: high osmotic pressure (high salt)


◉ Facultative halophiles tolerate.
Answer: high osmotic pressure

, ◉ Structural backbone of organic molecules.
Answer: Carbon


◉ Chemoheterotrophs use _______ _______ as energy.
Answer: organic molecules


◉ Autotrophs use ______ as energy.
Answer: CO2 Carbon dioxide


◉ Component of proteins, DNA, and ATP.
Answer: Nitrogen


◉ most bacteria decompose _________ material for the nitrogen
source.
Answer: protein


◉ Phosphorus.
Answer: used in DNA, RNA, and ATP, found in membranes


◉ Sulfur.
Answer: Used in amino acids, thiamine, and biotin