Multiple Choice
Which laboratory test is commonly used to confirm a diagnosis of HIV infection?
85
views
1. Introduction to Microbiology
Introduction to Microbiology
Multiple Choice
Which of the following best demonstrates mutualism between certain types of bacteria and humans?
A
Bacteria competing with human cells for nutrients
B
Pathogenic bacteria causing strep throat in humans
C
Bacteria living on human skin without affecting the host
D
Gut bacteria synthesizing vitamin K for human absorption
Verified step by step guidance1
Understand the concept of mutualism: Mutualism is a type of symbiotic relationship where both organisms involved benefit from the interaction.
Analyze each option to see if both bacteria and humans benefit: For example, bacteria competing with human cells for nutrients benefits bacteria but harms humans, so it is not mutualism.
Consider pathogenic bacteria causing strep throat: This harms humans and benefits bacteria, so it is not mutualism but parasitism.
Look at bacteria living on human skin without affecting the host: This is an example of commensalism, where bacteria benefit but humans are neither helped nor harmed.
Identify gut bacteria synthesizing vitamin K: Here, bacteria produce vitamin K which humans absorb and use, benefiting humans, while bacteria gain a stable environment and nutrients, demonstrating mutualism.
Related Videos
Related Practice
