1. Select the "TRUE" statement about microorganisms:

Eukaryotes lack a nuclear membrane, the nuclear genetic material is diffuse in the cell

Prokaryotes lack a nuclear membrane, the nuclear genetic material is diffuse in the cell

Only eukaryotes can produce spores, which are metabolic inactive bodies that survive extreme conditions

Viruses grow by themselves to reproduce without cells of host organisms to cause a number of diseases

2. Microorganisms can be classified based on the sources of energy and carbon that they utilize as chemoheterothrophs, chemoautothrops, photoheterothrophos, and photoautothrophs, where the term are derived from:

Prompt 1Autothroph Answer for prompt 1 Autothroph

Prompt 2Photo Answer for prompt 2 Photo

Prompt 3Chemo Answer for prompt 3 Chemo

Prompt 4Heterothroph

3. Select the "incorrect" description of a type of microorganism: Select the "incorrect" description of a type of microorganism:

Fungi are aerobic nonphotosynthetic organisms (e.g., yeast) that possess extracellular (exo-)enzymes

Protozoa are microscopic single eukaryotic cells that can cause human diseases but also have positive roles in the environment

Bacteria are multicellular microorganisms (individuals) that replicate exponentially and have a small surface/volume ratio

Algae are microscopic organisms that subsist on inorganic nutrient & produce {CH2O} from CO2 by photosynthesis

4. At the time zero, the cell count of a bacterial species mediating oxic respiration of wastes was 1 106 cells/L. At 30 min it was 2 106; at 60 min it was 4 106; at 90 min, 7 106; at 120 min, 10 106; and at 150 min, 13 106. From these data, which of the following logical conclusions would you draw? Hint: Plot the data using the correct scales. At the time zero, the cell count of a bacterial species mediating oxic respiration of wastes was 1 106 cells/L. At 30 min it was 2 106; at 60 min it was 4 106; at 90 min, 7 106; at 120 min, 10 106; and at 150 min, 13 106. From these data, which of the following logical conclusions would you draw? Hint: Plot the data using the correct scales.

The culture was leaving the log phase at the end of the 150-min period

The culture was in the log phase throughout the 150-min period

The culture was in the death phase throughout the 150-min period T

he culture was entering the log phase at the end of the 150-min period

The culture was in the lag phase throughout the 150-min period

5. The enzyme of a bacterium capable of degrading 2,4-D herbicide was found to have a maximum enzyme activity at pH 7.0, and 20% of its maximum activity at pH 4.8. Choose the pH at which it is most plausible for the bacterium to also have an enzyme activity close to 20% of the maximum: The enzyme of a bacterium capable of degrading 2,4-D herbicide was found to have a maximum enzyme activity at pH 7.0, and 20% of its maximum activity at pH 4.8. Choose the pH at which it is most plausible for the bacterium to also have an enzyme activity close to 20% of the maximum:

4.1

8.9

7.5

8.2