Which of the following best describes the diversity of the human microbiome?
It is found only in the gut.
It remains constant throughout a person's life.
It includes bacteria, viruses, fungi, and other microorganisms.
It consists of a single type of bacteria.
The Correct Answer is C
A. It is found only in the gut: While the gut harbors a large portion of the microbiome, microorganisms also inhabit the skin, oral cavity, respiratory tract, and urogenital tract.
B. It remains constant throughout a person's life: The microbiome is dynamic and can change due to diet, environment, medications, age, and illness, showing considerable variability over time.
C. It includes bacteria, viruses, fungi, and other microorganisms: The human microbiome is composed of a diverse array of microorganisms, including bacteria, viruses, fungi, and protozoa, all of which interact with the host and each other to influence health.
D. It consists of a single type of bacteria: The microbiome is highly diverse; a single bacterial species cannot represent its complexity or functional roles.
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Related Questions
Correct Answer is C
Explanation
A. To connect the upper and lower limbs: While the vertebral column provides attachment points for muscles and limbs, its primary role is not connecting the limbs directly.
B. To protect the heart and lungs: Protection of the heart and lungs is mainly provided by the thoracic cage, not the vertebral column.
C. To support the body and protect the spinal cord: The vertebral column provides structural support, maintains posture, and encases the spinal cord within the vertebral canal, safeguarding it from injury while allowing flexibility.
D. To protect the brain: The brain is protected by the skull; the vertebral column protects only the spinal cord, which is continuous with the brain.
Correct Answer is D
Explanation
A. To protect the brain: The brain is protected by the skull, which is a part of the axial skeleton. The pelvic girdle is located in the lower body and has no role in cranial protection. Its function is primarily structural and supportive rather than protective of the head.
B. To facilitate breathing: Breathing is supported by the diaphragm and ribcage, which expand and contract to allow air movement. The pelvic girdle does not contribute to respiratory mechanics but serves as a base for muscular attachment.
C. To connect the shoulder to the axial skeleton: The shoulder connects to the axial skeleton via the pectoral (shoulder) girdle, not the pelvic girdle. The pelvic girdle instead connects the lower limbs to the axial skeleton, providing stability for weight-bearing.
D. To support the weight of the upper body: The pelvic girdle bears the weight of the upper body and distributes it to the lower limbs. It also provides attachment points for muscles that aid in posture, locomotion, and movement, while supporting internal organs in the pelvic region.
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