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#plant metabolism

17 public questions tagged with this topic.

The shikimate pathway is involved in synthesis of:

Shikimate pathway bridges central metabolism and aromatic compound biosynthesis unique to plants, fungi, and bacteria, absent in animals. Starting substrates phosphoenolpyruvate from glycolysis and erythrose-4-phosphate from pentose phosphate pathway undergo condensation by DAHP synthase initiating seven enzymatic steps producing 3-dehydroquinate, dehydroshikimate, shikimate, shikimate-3-phosphate, EPSP, and chorismate. Chorismate branches to prephenate leading to phenylalanine and tyrosine via arogenate pathway, and to anthranilate leading to tryptophan. Aromatic amino acids contribute to pro

Ref: Herrmann & Weaver Annu Rev Plant Physiol 1999 shikimate pathway; NCBI NBK22426; Taiz & Zeiger Ch 13; https://www.ncbi.nlm.nih.gov/books/NBK22426/

Secondary metabolites are typically produced:

Pick B: In specialized tissues. Thinking through PSS- Sec G- Sec metabolites step by step rules out the lookalikes and leaves In specialized tissues. Skip these: A) In all cells equally; C) Only in roots; D) Only in leaves. For hormones and genes, match the molecule or gene to its real role, not a neighboring pathway.

Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.

Phenylpropanoid pathway originates from amino acid:

B fits best: Phenylalanine. Keep the PSS- Sec G- Sec metabolites basics straight and Phenylalanine stands out as the precise answer. Avoid: A) Tryptophan; C) Tyrosine; D) Methionine. Light and flowering items often hinge on which photoreceptor or day-length rule is in play.

Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.

Terpene synthases primarily catalyze:

Correct option is B, Carbon skeleton diversification. In PSS- Sec G- Sec metabolites problems like this, the accurate statement is Carbon skeleton diversification; the others are common mix-ups. Not these: A) C5 unit formation; C) Oxidation reactions; D) Glycosylation. Tissue transport questions usually turn on xylem vs phloem, living vs dead cells, or source vs sink.

Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.

In mevalonate pathway, how many acetyl-CoA molecules condense to form IPP?

Answer: B) Three. For PSS- Sec G- Sec metabolites, remember the key idea and you’ll land on this option; the distractors usually swap cause and effect or confuse similar terms. Avoid: A) Two; C) Four; D) Five. Name the process first, then pick the option that describes it — don’t reverse cause and effect.

Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.