Question

which of the following pairs of microbe classification terms and optimal growth temperatures is mismatched?
psychrotroph - growth at 20 - 30c
hyperthermophiles - growth at >80c
mesophile - growth at 25 - 40c
thermophile - growth at 37c
question 11 (1 point)
three cells with generation times of 60 minutes are inoculated into a culture medium. assuming no lag phase takes place, how many cells are there after 5 hours?
15
32
96
100

Explanation:

Question 1:

Psychrotrophs grow at 20 - 30°C, hyperthermophiles at >80°C, mesophiles at 25 - 40°C. Thermophiles grow at higher temperatures typically above 45°C, not 37°C which is body - temperature and more suitable for mesophiles.

Step1: Determine the number of generations

The generation time is 60 minutes (1 hour) and the total time is 5 hours. So the number of generations $n=\frac{5}{1}=5$.

Step2: Use the cell - growth formula

The initial number of cells $N_0 = 3$. The formula for cell growth is $N = N_0\times2^n$. Substitute $N_0 = 3$ and $n = 5$ into the formula: $N=3\times2^5$.

Step3: Calculate the result

$2^5=32$, and $3\times32 = 96$.

Answer:

thermophile - growth at 37°C

Question 2: