#elastin

Cell Communication and ECM

Which ECM component provides elasticity to tissues?

Elastin, is consistent with established principles of cell signaling, receptor pharmacology and cellular regulation. Experimental measurements of binding parameters, genetic loss-of-function studies and pharmacological interventions all converge on the same interpretation. Related options address neighboring concepts but do not satisfy the precise criterion stated in the question.

Ref: NCERT Biology Class 11–12 Alberts et al Molecular Biology of the Cell Lodish et al, Molecular Cell Biology Cooper & Hausman, The Cell Abbas et al., Cellular and Molecular Immunology (for immunology sections)

View Details

Protein

Which amino acid is critical for elastin cross-linking?

Lysine is the scientifically accurate answer to this question. Within the study of Protein, this concept is well-established through extensive research and is documented in standard scientific literature. The specific properties, mechanisms, or characteristics of Lysine directly address what is being asked. Among the other options, Histidine, Serine, and Alanine do not correctly answer this question because they either refer to different concepts, describe properties of other molecules or processes, or represent common misconceptions about this topic.

Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 4

View Details

Protein

Which of the following best describes desmosine?

A cross-linking unit in elastin is the scientifically accurate answer to this question. Within the study of Protein, this concept is well-established through extensive research and is documented in standard scientific literature. The specific properties, mechanisms, or characteristics of A cross-linking unit in elastin directly address what is being asked. Among the other options, A repeating sequence in collagen, A sulfur-containing amino acid, and A cofactor for hydroxylation do not correctly answer this question because they either refer to different concepts, describe properties of other molecules or processes, or represent common misconceptions about this topic.

Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 4

View Details

Protein

Which amino acid is highly abundant in elastin but not glycosylated?

Glycine is the correct choice because it does not accurately describe or belong to the category addressed in this question. In the context of Protein, the other options (Lysine, Proline, and Hydroxyproline) are all valid and well-established concepts. Glycine is either unrelated to the topic, describes a different biological process, or represents a common misconception. Questions framed as 'which is NOT' require students to identify the exception among otherwise correct statements, demanding comprehensive knowledge of the topic rather than recognition of a single fact.

Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 4

View Details

Protein

What is the functional unit of elastin?

Desmosine accurately defines or describes the concept asked in this question. Within Protein, precise definitions and terminology are essential for clear scientific communication. The other options (Tropoelastin, Microfibril, and Collagen) either describe related but distinct concepts, use incorrect terminology, or confuse similar-sounding terms that have different scientific meanings. A thorough understanding of exact definitions helps distinguish between closely related biological concepts and is crucial for competitive examinations.

Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 4

View Details