Which of the following accurately describes Moraxella catarrhalis?

Moraxella catarrhalis is accurately described as a Gram-negative cocci that cannot ferment glucose or maltose. This bacterium is known for its spherical shape and typically appears as diplococci when viewed under a microscope. It is part of the normal flora of the respiratory tract but can also be an opportunistic pathogen, particularly in individuals with underlying respiratory conditions.

The inability of Moraxella catarrhalis to ferment common sugars like glucose and maltose is a crucial aspect of its metabolism and helps distinguish it from other similar organisms. Instead, the organism primarily relies on oxidative metabolism. Understanding this characteristic is important for microbiological identification and for predicting the organism's behavior in clinical settings.

Other characteristics listed in the incorrect answers highlight different bacteria or provide misleading information about Moraxella catarrhalis. Recognizing these key features helps to accurately classify the organism and understand its role in infections.