Microbes benefit humans by.
Causing only infections
Making us sick
Producing vitamins and aiding immunity
Blocking oxygen
The Correct Answer is C
A. Causing only infections: Microbes can cause infections but do much more than only cause disease.
B. Making us sick: Many microbes are pathogenic, but many are beneficial or neutral; saying they “make us sick” overlooks beneficial roles.
C. Producing vitamins and aiding immunity: Microbes (e.g., gut bacteria) synthesize vitamins like K and some B vitamins and help train and regulate the immune system.
D. Blocking oxygen: Microbes do not generally “block oxygen” as a benefit to humans; this is not a recognized beneficial function.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Standing, facing forward, arms at sides, palms forward: The anatomical position is the standard reference posture: standing erect, facing forward, arms at sides with palms facing anteriorly.
B. Lying face down: This is the prone position, not the anatomical position.
C. Sitting with arms crossed: This is a nonstandard posture and not used as the anatomical reference.
D. Sitting with palms backward: Anatomical position specifies standing and palms facing forward, not sitting with palms backward.
Correct Answer is C
Explanation
A. Ribosome: Ribosomes are the sites of protein synthesis and contain rRNA and proteins, not the cell’s main DNA.
B. Membrane: The cell membrane separates interior from exterior and contains proteins/lipids, but it does not house the cell’s genetic material.
C. Nucleus: In eukaryotic cells most DNA is organized into chromosomes within the nucleus.
D. Cytoplasm: The cytoplasm contains many components and, in prokaryotes, the nucleoid (DNA) is cytoplasmic; mitochondria in eukaryotes also contain small amounts of DNA.
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