Which one of the following does not belong with the others?
a. Enterococcus
b. Lactobacillus
c. Staphylococcus
d. Streptococcus
e. All are grouped together.

검증된 단계별 안내

Step 1: Identify the characteristics of each genus listed: Enterococcus, Lactobacillus, Staphylococcus, and Streptococcus.

Step 2: Note that Enterococcus, Lactobacillus, and Streptococcus are all Gram-positive cocci or rods that are generally catalase-negative and often associated with lactic acid production.

Step 3: Recognize that Staphylococcus is also Gram-positive but differs because it is catalase-positive and forms clusters rather than chains or pairs.

Step 4: Compare the oxygen requirements and typical habitats of these genera; for example, Lactobacillus is a rod-shaped lactic acid bacterium, while the others are cocci.

Step 5: Conclude which genus does not belong based on differences in morphology, catalase reaction, or grouping characteristics.

비슷한 문제에 대한 검증된 영상 답변:

이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.

영상 길이:

주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Gram-Positive Bacteria Classification

Gram-positive bacteria have thick peptidoglycan cell walls and stain purple in Gram staining. Understanding their classification helps differentiate genera like Enterococcus, Lactobacillus, Staphylococcus, and Streptococcus based on shape, arrangement, and physiology.

Bacterial Morphology and Arrangement

Bacterial shape and arrangement are key for identification: cocci are spherical, bacilli are rod-shaped. Staphylococcus and Streptococcus are cocci but differ in cluster (grape-like) versus chain arrangements, while Lactobacillus is rod-shaped, distinguishing it from the others.

Oxygen Requirements and Metabolism

Different genera vary in oxygen tolerance: Staphylococcus is facultative anaerobic, Enterococcus is also facultative anaerobic, Lactobacillus is aerotolerant anaerobic, and Streptococcus is facultative anaerobic. These metabolic traits help group or separate bacteria in clinical and ecological contexts.

Which one of the following does not belong with the others?a. Enterococcusb. Lactobacillusc. Staphylococcusd. Streptococcuse. All are grouped together.