Workspace▸ Science▸ Test 113
← Back to Science
Science · Drill 113

Science practice 113

6 questions ~9 min recommended
⏱ 00:00
Score
—

Table 1
Growth points or ranges (°C)

Classifications Minimum Optimum Maximum
Psychrophile below 0 10-15 below 20
Psychrotroph 0-5 15 30
Mesophile 5-25 18-45 30-50
Thermophile 25-45 50-60 60-90

Table 2

Bacteria name Minimum Optimum Maximum
Anoxybacillus flavithermus 30 60 72
Bacillus flavothermus 30 60 72
Clostridium perfringens 15 45 50
Escherichia coli 10 37 45
Listeria monocytogenes 1 34 45
Micrococcus cryophilus 10 15 30
Staphylococcus aureus 20 37 45
Streptococcus pyogenes 25 37 40
Streptococcus pneumoniae 28 37 42

Bacteria can be categorized by how they respond, as indicated by reproduction and growth, to certain temperatures. They are grouped into four categories-psychrophiles, psychrotrophs, mesophiles, and thermophiles-based on their growth response to certain temperatures. Minimal growth point is the lowest temperature at which the bacteria will reproduce. Optimum growth point is the temperature at which the bacteria reproduce most efficiently. Maximum growth point is the very highest temperature to which the bacteria will respond, beyond which the bacteria will not reproduce at all. Table 1 lists the types of bacteria as well as the growth points for each.

Table 2 represents a list of common bacteria and their growth points.

1. The category of bacteria appearing the most frequently in Table 2 is:

2. The type of bacteria found in Table 2 that does not fit exactly into any of the categories listed in Table 1 is:

3. Average human body temperature is 40°C. According to Table 2, which of the following bacteria would grow most successfully in the human body?

4. A new bacteria was discovered by scientists. It reproduces best at 55°C and does not show any new growth if exposed to temperatures above 65°C. This bacteria can most likely be categorized as a:

5. Based on the information in Table 2, which bacteria has the smallest growth range?

6. According to information provided in the passage, Listeria monocytogenes stop reproducing at what temperature?

← Prev test Next test →
Jump to