Which of the following structures would aid a cell in allowing more nutrients to be absorbed by the cell?
microvilli
stereocilia
primary cilia
flagella
The Correct Answer is A
A. Microvilli: Microvilli are tiny, finger-like projections on the apical surface of some cells, especially in the small intestine. They increase the surface area of the plasma membrane, allowing the cell to absorb more nutrients efficiently.
B. Stereocilia: Stereocilia are long, non-motile projections found in certain specialized cells, such as in the epididymis, and are primarily involved in mechanosensation and absorption, but they are less widespread than microvilli.
C. Primary cilia: Primary cilia are single, non-motile organelles present on many cells that function mainly as sensory structures to detect environmental signals rather than increase nutrient absorption.
D. Flagella: Flagella are long, whip-like structures used for cell motility, such as in sperm cells. They do not contribute significantly to nutrient absorption.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Primary structure: The primary structure refers to the linear sequence of amino acids in a polypeptide chain. It does not include any folding or coiling of the chain.
B. Quaternary structure: Quaternary structure arises when multiple polypeptide chains or subunits associate to form a functional protein complex. It is not related to the coiling of a single chain.
C. Secondary structure: Secondary structure is characterized by local folding patterns of the polypeptide backbone, including alpha helices and beta sheets, stabilized by hydrogen bonds between backbone atoms. The alpha helix is a classic example of this level of structure.
D. Tertiary structure: Tertiary structure refers to the overall three-dimensional folding of a single polypeptide chain, determined by interactions between side chains, not the regular coiling of the backbone.
Correct Answer is A
Explanation
A. Secondary structure: The secondary structure of a protein involves local folding patterns of the polypeptide backbone, including alpha helices and beta sheets, stabilized by hydrogen bonds between backbone atoms. The coiling into an alpha helix is a classic example of this level.
B. Primary structure: The primary structure is the linear sequence of amino acids in the polypeptide chain, without any folding or coiling.
C. Tertiary structure: Tertiary structure refers to the overall three-dimensional folding of a single polypeptide chain due to interactions between side chains, not the coiling of the backbone.
D. Quaternary structure: Quaternary structure arises when multiple polypeptide chains or subunits come together to form a functional protein complex, beyond the level of alpha helix formation.
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