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#secretion

2 public questions tagged with this topic.

Dictyostelium

Cells secreting DIF-1:

DIF-1 biosynthetic genes stlB encoding polyketide synthase and dmtA encoding desmethyl DIF-1 methyltransferase are preferentially transcribed in prespore region under cAMP and PKA induction. Prespore cells therefore synthesize chlorinated polyketide and release it, where it diffuses to anterior prestalk population acting paracrinally. Prestalk cells contain receptors and downstream STAT machinery but low biosynthetic capacity, functioning as responders. Stalk cells and mature spores show negligible synthesis. This spatial separation creates feedback loop ensuring prespore majority controls stalk proportion; disruption of prespore-specific DIF production alters ratio, producing fruiting bodies with inadequate stalk support and reduced spore elevation.

Ref: Development Journal, DIF-1 biosynthesis genes stlB/dmtA in prespore cells - feedback regulation of stalk proportion.

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Endocrinology

Estrogens and progesterone are mainly secreted by:

Correct option is C, Ovaries. In Endocrinology, the accurate description is Ovaries, and that is what you should commit to memory. Keep the definition tight and the role clear — the functional job described in the stem is exactly what Ovaries does in Endocrinology. Then Ovaries is the answer you can defend. Check yourself by covering the options and writing the answer first, then matching the letter — that builds confidence. If the wording feels dense, translate it into everyday language first, then map that plain sentence back onto Ovaries. Remember that physiology questions reward precise language: name the process, the location, and the outcome, then match that to the option text.

Ref: Animal physiology is Unit 7 of the CSIR NET Life Science Syllabus, covering core body systems. It accounts for roughly 10% of the total marks in Sections B and C.

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