Microbiology with Diseases by Body System, 5e
CHAPTER 6 Microbial Nutrition and Growth
Multiple Choice
Fill in the Blanks
1. electrons 6. osmotic 11. inorganic
Visualize It!
Short Answer
1. In high temperatures, lipids of the cell membrane become fluid, and the cell contents
3. Quorum sensing is a process whereby bacteria secrete molecules into their environment,
5. Agar is a substance indigestible by most microbes in which various nutrients can be
Answers to End-of-Chapter Questions
11.
Description
Energy Source
Carbon Source
Photoautotrophs Light CO2
12. All three media provide nutrients necessary for the growth of E. coli. The medium for
growing E. coli presented in Table 6.3 is defined, because every ingredient is identified
Critical Thinking
2. A temperature of 72°C exceeds the maximum survival temperature for many pathogens,
3. The dry weight of the culture grown in the presence of oxygen is much greater than the
Microbiology with Diseases by Body System, 5e
8. Microbes use phosphorus in ATP to store energy and as part of the structure of
nucleotides, which make up DNA and RNA, and phospholipids, which make up the
11. Based on the 10-4 dilution plate, the calculation is: 45 colonies 10,000 (the reciprocal of
15. Elevation of temperature can result in denaturation of proteins and loss of function,
17. Various answers are possible, depending on the colonies chosen. For example, the large
Answers to End-of-Chapter Questions
22. Beijerinck may have used a simple defined medium containing no organic forms of
23. Viable plate counts are determined by plating serial dilutions of the sample to be
quantified, ensuring that at least one plating will have countable numbers of colonies in a
Concept Mapping
1. General Purpose