MCQs Archive - Page 992 of 1097

What is a primary function of the gallbladder, a small organ located near the liver?

AProducing insulin

BStoring and concentrating bile produced by the liver

CFiltering the blood

DProducing red blood cells

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Which scientist is widely credited as the founder of modern genetics, based largely on his experiments studying inherited traits in pea plants?

AAlexander Fleming

BGregor Mendel

CLouis Pasteur

DCharles Darwin

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In basic genetics, what generally happens when an organism inherits one dominant and one recessive version of a gene for a particular trait?

AThe recessive trait is always expressed

BBoth traits blend together completely

CThe dominant trait is typically the one that is expressed

DNeither trait is expressed at all

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An allergy occurs when the immune system reacts abnormally to what type of substance?

AOnly to substances that are inherently toxic to everyone

BOnly to extreme temperatures

CTo substances that are typically harmless to most people

DOnly to bacteria and viruses

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In immunology, what term describes a substance, often found on the surface of a pathogen, that triggers a specific response from the immune system?

AAntigen

BEnzyme

CAntibody

DHormone

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How does vaccination generally help protect a person against a specific disease in the future?

ABy training the immune system to recognize and respond quickly to a specific pathogen without causing the actual disease

BBy permanently curing all existing infections in the body

CBy directly killing pathogens already present in the bloodstream

DBy eliminating the need for the immune system entirely

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Where in the human body are most blood cells primarily produced?

AIn the bone marrow

BIn the lungs

CIn the stomach

DIn the liver exclusively

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Blood plasma, the liquid component of blood, primarily serves what function?

ADirectly transporting oxygen through hemoglobin

BClotting wounds on its own

CCarrying blood cells, nutrients, hormones, and waste products throughout the body

DProducing new blood cells

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What is the primary role of the diaphragm, a dome-shaped muscle located beneath the lungs?

APumping blood throughout the body

BFiltering toxins from the blood

CProducing hormones for digestion

DContracting and relaxing to facilitate breathing

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What is the function of the epiglottis, a small flap of tissue located at the top of the windpipe?

AIt closes over the windpipe during swallowing to prevent food from entering the airway

BIt regulates heart rate

CIt filters air entering the lungs

DIt produces digestive enzymes

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