Question

After 48 hours of incubation, the surface of a starch agar plate growing a test bacterium is flooded with iodine. The entire plate turns into a blue-black color. This indicates that: A. the test organism hydrolyzes amylase but not amylopectin. B. the test organism hydrolyzed starch. C. the test organism hydrolyzes amylopectin but not amylase. D. the test organism did not hydrolyze starch. Acid-fast cell walls have a high lipid content, including a waxy material called ______. A. phospholipid B. coagulase C. carbolfuchsin D. mycolic acid Which test can be used to differentiate Streptococcus pneumoniae from an alpha hemolytic viridians streptococcus? A. Catalase test B. SXT sensitivity C. Optochin susceptibility D. Bacitracin susceptibility What is the substrate for the catalase enzyme? A. Oxygen B. Glucose C. Water D. Hydrogen peroxide Some organisms exhibit flexibility in terms of their energy harvesting reactions. If provided with oxygen, they will obtain energy through aerobic respiration. If in an environment without oxygen, they will turn to fermentation to satisfy their energy needs. These organisms are classified as: A. microaerophiles B. facultative anaerobes. C. obligate aerobes. D. obligate anaerobes.

          After 48 hours of incubation, the surface of a starch agar plate growing a test bacterium is flooded with iodine. The entire plate turns into a blue-black color. This indicates that:

A. the test organism hydrolyzes amylase but not amylopectin.
B. the test organism hydrolyzed starch.
C. the test organism hydrolyzes amylopectin but not amylase.
D. the test organism did not hydrolyze starch.

Acid-fast cell walls have a high lipid content, including a waxy material called ______.

A. phospholipid
B. coagulase
C. carbolfuchsin
D. mycolic acid

Which test can be used to differentiate Streptococcus pneumoniae from an alpha hemolytic viridians streptococcus?

A. Catalase test
B. SXT sensitivity
C. Optochin susceptibility
D. Bacitracin susceptibility

What is the substrate for the catalase enzyme?

A. Oxygen
B. Glucose
C. Water
D. Hydrogen peroxide

Some organisms exhibit flexibility in terms of their energy harvesting reactions. If provided with oxygen, they will obtain energy through aerobic respiration. If in an environment without oxygen, they will turn to fermentation to satisfy their energy needs. These organisms are classified as:

A. microaerophiles
B. facultative anaerobes.
C. obligate aerobes.
D. obligate anaerobes.

Added by Josefa M.

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