___ epithelium allows for rapid diffusion of oxygen and carbon dioxide through the alveoli of the lungs.
Nonkeratinized stratified squamous
Simple columnar
Simple squamous
Simple cuboidal
The Correct Answer is C
A. Nonkeratinized stratified squamous: This epithelium type is found in areas subject to friction and abrasion, such as the esophagus and oral cavity. Its multiple layers make it unsuitable for efficient gas exchange, as diffusion is slowed by the thickness of the tissue.
B. Simple columnar: Simple columnar epithelium is specialized for absorption and secretion, commonly found in the gastrointestinal tract. Its tall cell structure is not ideal for rapid diffusion, making it poorly suited for alveolar gas exchange.
C. Simple squamous: Simple squamous epithelium consists of a single, thin layer of flat cells. Its delicate structure provides a minimal barrier for diffusion, allowing oxygen and carbon dioxide to rapidly pass through the alveolar walls during respiration.
D. Simple cuboidal: Simple cuboidal epithelium is found in glands and kidney tubules where secretion and absorption occur. Its cube-shaped cells are thicker than squamous cells, creating a greater distance for gases to diffuse, which reduces efficiency in the lungs.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. gluconeogenesis, citric acid cycle, lipolysis:Gluconeogenesis is the synthesis of glucose from non-carbohydrate sources, and lipolysis is the breakdown of fats. Neither represents the complete oxidation of glucose for energy production.
B. glycogenesis, lipogenesis, oxidative phosphorylation of the electron transport chain:Glycogenesis and lipogenesis involve the storage of glucose and fat, respectively, rather than its breakdown for ATP production.
C. glycolysis, citric acid cycle, oxidative phosphorylation of the electron transport chain:Glycolysis breaks glucose into pyruvate in the cytoplasm. The citric acid cycle oxidizes acetyl CoA derived from pyruvate, producing NADH and FADH₂. These coenzymes then donate electrons in the electron transport chain for oxidative phosphorylation, generating ATP, completing glucose oxidation.
D. lipolysis, glycogenolysis, beta oxidation:These processes involve the breakdown of fats and glycogen, not the full oxidation of glucose, so they do not represent the standard cellular respiration pathway.
Correct Answer is B
Explanation
A. TGCUU:RNA does not contain thymine (T); it contains uracil (U) instead. The presence of thymine makes this option incompatible with proper mRNA synthesis.
B. UGCAA:Complementary base pairing rules state that adenine (A) pairs with uracil (U) in RNA, cytosine (C) with guanine (G), guanine (G) with cytosine (C), thymine (T) with adenine (A), and thymine (T) with adenine (A).
C. ACGTT:This is identical to the DNA template strand and not complementary. The mRNA strand must be complementary to the DNA template strand, not a direct copy of it.
D. GUACC:This sequence does not match the base-pairing rules for the given DNA template. It represents a mismatch in complementary pairing, making it inaccurate for mRNA transcription.
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