Biochemistry- ICAR JRF/SRF 2024

• Standard SI Metric Multiples & Submultiples:
• Peta (P) represents $10^{15}$ (quadrillion) $\rightarrow$ (III)
• Deca (da) represents $10^{1}$ (ten) $\rightarrow$ (IV)
• Femto (f) represents $10^{-15}$ (quadrillionth) $\rightarrow$ (II)
• Deci (d) represents $10^{-1}$ (tenth) $\rightarrow$ (I)
• Systematic Match: (A)-(III), (B)-(IV), (C)-(II), (D)-(I) corresponds to Option 3.

Correct option: (3) (A) - (III), (B) - (VY), (C)- (II), (2) - (1)

• Core Assumptions of Analysis of Variance (ANOVA):

• Normality: Errors (and observation populations) are normally distributed.
• Homoscedasticity: Variances across treatment populations are equal (homogeneity of variances).
• Independence: Experimental errors and observations are independent of each other.
• Additivity: Treatment and environmental/block effects are additive.
  • Why "Blocks" is NOT an Assumption: Blocking is a technique of local control in experimental design (e.g., in RCBD) used to partition field heterogeneity, not an underlying statistical assumption of the ANOVA mathematical model.

• First Generation $

ightarrow$ (II) Sanger method: Dideoxy chain termination sequencing using fluorescent ddNTP terminators and capillary electrophoresis.

• Second Generation (NGS) $

ightarrow$ (IV) Illumina sequencing: High-throughput sequencing-by-synthesis utilizing reversible dye terminators on clonal flow-cell clusters.

• Third Generation $

ightarrow$ (I) HeliScope single molecule sequencer: Pioneer single-molecule real-time sequencing platform (Helicos BioSciences) without preliminary clonal PCR amplification.

• Fourth Generation $

ightarrow$ (III) Oxford Nanopore method: Direct single-molecule sequencing measuring disruptions in ionic current as native nucleic acid strands traverse biological protein nanopores.

Correct option: (2) (A) = (Hl), (B) - (IV), (C)- (), (D) = (tll)

• Definition of Bioinformatics: Coined by Paulien Hogeweg and Ben Hesper (1970), bioinformatics is the interdisciplinary science that utilizes computational tools, software algorithms, and statistical databases to manage, store, analyze, annotate, and model large-scale macromolecular sequences (DNA, RNA, proteins) and macromolecular 3D structures.
• Distinction from Other Disciplines: Metagenomics is the genomic analysis of uncultured environmental microbial communities; metatranscriptomics analyzes overall community RNA expression; biostatistics encompasses statistical modeling of biological experiments.

Correct option: (3) Bioinformatics

• Assertion (A) is True: Two-dimensional difference gel electrophoresis (2D-DIGE) enables direct quantitative comparison of protein abundance across multiple experimental samples within a single 2D polyacrylamide gel.
• Reason (R) is True & Explains (A): Distinct protein samples are pre-labeled with charge- and mass-matched, spectrally distinct fluorescent dyes (Cy2, Cy3, Cy5) and pooled before isoelectric focusing and SDS-PAGE, completely eliminating gel-to-gel experimental variation.
• Conclusion: Both (A) and (R) are true and (R) is the correct explanation of (A).

Correct option: (1) Both (A) and (R) are true and (R) is the correct explanation of (A)