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Henking discovered the X-chromosome while studying insect spermatogenesis.
Ref: NCERT Class 12 Biology Chapter 4: Principles of Inheritance and Variation Chromosomal Theory Linkage Recombination Gene Mapping
Purification of DNA-dependent RNA synthesizing activity in Escherichia coli extracts was achieved independently by Samuel B. Weiss and Jerard Hurwitz around 1960, shortly after identification of messenger RNA concept. Using radiolabeled nucleoside triphosphates incorporation assays, they demonstrated enzyme requirement for double-stranded DNA template, four rNTPs, and magnesium, producing RNA-DNA hybrid product distinct from polynucleotide phosphorylase. Watson and Crick had elucidated DNA structure, Jacob and Monod operon regulation, Kornberg DNA polymerase. Weiss and Hurwitz discovery clarified enzyme responsible for operon transcription, foundational for understanding promoter specificity and sigma factor regulation in molecular biology history.
Ref: Watson Molecular Biology of Gene Historical notes Prokaryotic RNA polymerase discovery Weiss Hurwitz 1960; Lehninger History transcription enzymology
Friedrich Miescher is the scientifically accurate answer to this question. Within the study of Nucleic Acid, this concept is well-established through extensive research and is documented in standard scientific literature. The specific properties, mechanisms, or characteristics of Friedrich Miescher directly address what is being asked. Among the other options, Richard Altman, Erwin Chargaff, and Rosalind Franklin 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: Campbell Biology, Urry et al., 12th Ed.
The right choice is C: Germination stimulants of parasitic weeds. In Striglactone, that matches how the process or concept actually works — the other choices mix up related ideas or use the wrong mechanism. Skip these: A) Shoot branching hormones; B) Root growth inhibitors; D) Stress hormones. A quick check: if an option needs energy, pumps, or the opposite direction of movement, ask whether that really applies.
Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.
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