Microbial Biodiversity

If the iodine step were omitted in the Gram-staining procedure, what color would you expect Gram-positive bacteria to stain and what color would you expect Gram-negative bacteria to stain?

• Gram-positive = purple; Gram-negative = red

• Gram-positive = purple; Gram-negative = purple

• Gram-positive = purple; Gram-negative = colorless

• Gram-positive = red; Gram-negative = red

Choose the best microscope to visualize relative species abundance in microbial communities

• combination of microscopy and species-specific oligonucleotide hybridization probes

• combination microscopic techniques and spectrophotometric assays with X-ray fluorescence

• confocal laser scanning microscopy

• backscattered scanning electron microscopy

Bacterial physiology differs from one type of organism to another. Base on this statement bacterium can be identify using

• Biochemical Test

• 16s rRNA

• Morphology observation

• Riboprinter analysis

One way to determine the size, cell morphology and grouping of bacterial cells is to use a __________ technique.

• streak plate

• phenol red

• simple stain

• nutrient broth culture

Choose the correct comparison between catabolism and anabolism

• Catabolism is synthesis processes whereas anabolism degrade compounds

• Catabolism is exergonic whereas anabolism endergonic in nature

• Catabolism produce macromolecules whereas anabolism produce small molecules

• Both processes do not link to each other

Tags

NGSS.HS-LS2-5

Enzymes work by which of the following?

• increasing the activation energy

• reducing the activation energy

• making exergonic reactions endergonic

• making endergonic reactions exergonic

The term apoenzyme is applicable to

• Simple enzyme

• Protein part of conjugate enzyme

• Organic cofactor of a conjugate enzyme

• Inorganic cofactor of a conjugate enzyme

Bacillus sp was grown on starch agar. After 24 hours of incubation, iodine has been added to the plate and clearing zone can be observing around the colony. Explain how it could be

(a)  

In a viable plate count, each ___represents a ___from the sample population.

• cell, colony

• colony, cell

• hour, generation

• cell, generation

Toxic forms of oxygen are broken down by several enzymes in obligate aerobes bacteria. List all the possible enzyme

(a)