#CSIR NET

Translation Basics

CSIR NET Dec 2006 polysome question answer was

Polysome concept describes multiple ribosomes translating simultaneously on single mRNA, observed as cluster of particles in electron micrographs and heavy fractions in sucrose gradients. The CSIR NET 2006 question tested this definition: string of ribosomes on one mRNA producing multiple copies of same polypeptide, increasing translational efficiency without extra transcription. Polysome profiling assesses translational status: stress or initiation inhibition shifts mRNAs from heavy polysomes to monosomes, indicating global control. Thus polysome reflects coordination of transcription and translation to meet cellular protein demand efficiently.

Ref: Lodish et al., Molecular Cell Biology, 9th ed., Chapter 7, Polysome definition and translational profiling – CSIR NET context

View Details

Life Table Age Pyramid

CSIR NET 2012: A species with lx = 1.0, 0.5 and mx = 0, 20 for age 0 and 1 respectively has R₀ =

“10” for csir net 2012: a species with lx = 1.0, 0.5 and mx = 0, 20 for age 0 and 1 respectively has r₀ =. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Survivorship curves summarize age-specific mortality: Type I concentrates loss late in life, Type II approximates a constant hazard, and Type III concentrates loss early. They are empirical patterns, not rigid taxonomic rules. The remaining alternatives—“1”, “5”, “20”—refer to different states, processes, or scales and therefore do not express the same causal relationship. Selection favors the schedule that increases lifetime reproductive success under local mortality and resource conditions. Body size, development time, fecundity, parental investment, and generation length consequently tend to covary. The cited framing is therefore most useful when treated as a conditional biological claim, with assumptions about scale and environmental context kept explicit.

Ref: Ecology: Concepts and Applications, Molles, 9th Ed., Ch. 10

View Details

Lotka Volterra Model

CSIR NET: For α = 1, β = 1.3, KA = 150, KB = 200, outcome will be:

“Species B wins” for csir net: for α = 1, β = 1.3, ka = 150, kb = 200, outcome will be. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Coexistence requires stabilizing differences that make each species limit itself more strongly than it limits its competitor, or an equalizing process that keeps fitness differences small. Without such mechanisms, persistent competitive asymmetry tends toward exclusion. The remaining alternatives—“Species A wins”, “Stable equilibrium”, “Unstable equilibrium”—refer to different states, processes, or scales and therefore do not express the same causal relationship. Evidence should connect encounter rates or resource use to survival, growth, or reproduction. The ecological label follows that causal effect rather than superficial proximity between organisms. The cited framing is therefore most useful when treated as a conditional biological claim, with assumptions about scale and environmental context kept explicit.

Ref: Ecology: Concepts and Applications, Molles, 9th Ed., Ch. 13-14

View Details

Cytokinin

Biosynthesis of cytokinins starts with enzyme:

B fits best: IPT. Keep the Cytokinin basics straight and IPT stands out as the precise answer. Avoid: A) LOG; C) CKX; D) CYP735A. Light and flowering items often hinge on which photoreceptor or day-length rule is in play.