3
lesson pretestMultiple Choice

Pretest

Question 3 • TPS EdX Biology

Which form of bacteria is matched correctly to its description?

Answer
A
coccus—can cause MRSA and has a round shape
B
coccus—can cause acne and has a spiral shape
C
bacillus—has a spherical shape and can form clusters
D
spirillum—has a rod shape and exists in chains or alone

Explanation

A coccus is a spherical or round-shaped bacterium, and Staphylococcus aureus, which can cause MRSA infections, is a coccus. Acne-causing bacteria are rod-shaped rather than spiral, and bacilli are rods, not spheres. Spirilla have a spiral shape, not a rod shape.

AI-written and checked against the verified answer.

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