_________ epithelium appears to have two or three layers of cells, but all the cells are in contact with the basement membrane.
Pseudostratified columnar
Stratified cuboidal
Stratified columnar
Transitional
The Correct Answer is A
A. Pseudostratified columnar: Pseudostratified columnar epithelium appears multilayered due to nuclei positioned at different levels, but every cell contacts the basement membrane. This arrangement allows for functions such as secretion and movement of mucus, often aided by cilia in the respiratory tract.
B. Stratified cuboidal: Stratified cuboidal epithelium consists of two or more true layers of cuboidal cells, with only the basal layer in contact with the basement membrane. It provides protection and is typically found in ducts of glands.
C. Stratified columnar: Stratified columnar epithelium has multiple layers with only the deepest cells touching the basement membrane. It is rare and mainly found in parts of the pharynx, male urethra, and some glandular ducts.
D. Transitional: Transitional epithelium is specialized for stretching and recoiling, found in the urinary bladder. Cells change shape depending on tension, and not all layers contact the basement membrane.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. melanin:Melanin is the primary pigment responsible for skin color, produced by melanocytes in the epidermis. It provides protection against ultraviolet (UV) radiation and contributes to variations in skin tones among individuals.
B. hemoglobin:Hemoglobin in red blood cells contributes to the pinkish or reddish hue of the skin, particularly in light-skinned individuals, due to oxygenated blood flowing close to the surface.
C. carotene:Carotene is a yellow-orange pigment found in certain vegetables and can accumulate in the skin, especially in the stratum corneum and fatty tissues, influencing skin color.
D. All can contribute to skin color:Skin color is determined by a combination of melanin, hemoglobin, and carotene. The relative influence of each pigment varies, but together they produce the wide range of human skin tones.
Correct Answer is D
Explanation
A. RNA:RNA is a general term for ribonucleic acid and includes several types with different functions. It does not specifically refer to the RNA that delivers amino acids to the ribosome.
B. mRNA:Messenger RNA carries the genetic code from DNA to the ribosome, directing the sequence of amino acids in a protein, but it does not transport the amino acids themselves.
C. sRNA:Small RNA molecules (sRNA) are involved in regulatory processes within the cell, such as gene silencing, and are not responsible for delivering amino acids for protein synthesis.
D. tRNA:Transfer RNA is responsible for bringing specific amino acids to the ribosome during translation. Each tRNA recognizes codons on the mRNA and ensures that the correct amino acids are added to the growing polypeptide chain.
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