How many sister chromatids are in the rice (Oryza sativa) plant... | Agrigyan

Q.1

Biochemistry- ICAR JRF/SRF 2024 (Q.54)

MCQ (Single Correct) +4 −1

How many sister chromatids are in the rice (Oryza sativa) plant cell entering the first meiotic division?

24 12 48 Correct 6

Rice Chromosome Number: Cultivated rice (Oryza sativa) is a diploid species with $2n = 2x = 24$ chromosomes.
Meiotic S-phase & Chromatid Count: Prior to entering Prophase I of Meiosis I, the cell completes interphase DNA replication. Consequently, each of the 24 chromosomes consists of two identical sister chromatids joined at the centromere.
Calculation:

$$\text{Total Sister Chromatids} = 24 \text{ chromosomes} \times 2 = 48 \text{ sister chromatids}$$

Correct option: (3) 48

Explanation not matching this question? क्या व्याख्या इस प्रश्न से मेल नहीं खा रही? Report

Want to practice this paper in exam conditions? क्या आप परीक्षा जैसे माहौल में अभ्यास करना चाहते हैं? Test yourself in 5-question batch format with timer and hidden answers. 5-प्रश्नों के बैच फॉर्मैट, टाइमर और छिपे उत्तरों के साथ खुद को परखें।

Start Practice Mode → प्रैक्टिस टेस्ट मोड शुरू करें →

General Agriculture

6 Topics

Agronomy, Tillage & Field Crop Production Cell Biology, Plant Physiology & Biochemistry Agricultural Entomology, Nematology & Crop Protection Agricultural Meteorology & Climate Science Soil Science, Plant Nutrition & Reclamation Crop Genetics, Plant Breeding & IPR

Basic Biochemistry and Biomolecules

3 Topics

Amino Acids, Peptides, and Proteins: Structure, Classification, and Conformation Carbohydrates and Lipids: Structure, Stereochemistry, and Properties Cell Structure, Biomembranes, and Bioenergetics

Cell Organelles and Water Relations

2 Topics

Plant Cell Architecture, Organelles, Cytoskeleton and Membrane Transport Ascent of Sap, Transpiration, Stomatal Mechanics and Guttation

Cell Structure and Function

1 Topic

Cell Cycle Regulation, Checkpoints, Signal Transduction and Apoptosis Active

Basic Microbiological Techniques

1 Topic

Culture Media Formulations, Pure Culture Isolation, Lyophilization and Preservation

Biomolecules and Metabolism

1 Topic

Amino Acids, Protein Folding, Heat Shock Proteins and Secondary Metabolites

Intermediary Metabolism

3 Topics

Carbohydrate Metabolism: Glycolysis, TCA Cycle, Glyoxylate Pathway, and Gluconeogenesis Oxidative Phosphorylation, Electron Transport Chain, and Metabolic Regulation Lipid Metabolism, Beta-Oxidation, and Ketone Bodies

Enzymes, Vitamins and Hormones

2 Topics

Enzyme Catalysis, Kinetics, Allostery, and Mechanisms Coenzymes, Isozymes, and Vitamins

Microbial Physiology

1 Topic

Microbial Secondary Metabolism, Industrial Enzymes, Vitamins and Fermented Foods

Abiotic Stress Responses in Plants

1 Topic

Drought and Water Deficit Stress Physiology and Osmotic Adjustment

Molecular Biology

3 Topics

DNA and RNA Structure, Replication, and Repair Transcription, RNA Processing, and Gene Regulation Genetic Code, Protein Translation, and Post-Translational Modifications

Molecular Genetics

1 Topic

Gene Concept, Split Genes, Overlapping Genes and Operon Regulation

Gene Expression

1 Topic

Central Dogma, DNA Replication Machinery and Replication Origins

Plant Growth Regulators and Plant Development

2 Topics

Auxins and Cytokinins: Biosynthesis, Transport, Signaling and Morphogenesis Abscisic Acid, Ethylene, and Jasmonates: Signaling and Stress Responses

Techniques in Biochemistry

3 Topics

Spectroscopy, Mass Spectrometry, and Radioisotope Techniques Immunological Techniques, Blotting, and Omics Technologies Chromatography and Electrophoresis

Biochemistry of Food-grains, Fruits and Vegetables

2 Topics

Food Grain Composition, Storage Proteins, and Nutritional Quality Biochemistry of Fruit Ripening, Post-Harvest Changes, and Nutraceuticals

Microbial Diversity and Ecology

1 Topic

Wastewater Treatment (Bardenpho Process), Xenobiotics and Pesticide Biodegradation

Mineral Nutrition

1 Topic

Essential Plant Nutrients: Classification, Essentiality Criteria and Biochemical Roles

Molecular Biology Techniques

1 Topic

Electrophoresis, Centrifugation, Chromatography and Protein Estimation

Photosynthesis

3 Topics

Photorespiration and Starch-Sucrose Partitioning Carbon Fixation: C3 Cycle, C4 Pathway, and CAM Light Reactions, Photosystems, and Photophosphorylation

Molecular Biology

1 Topic

DNA Repair Pathways, Ribosomes and Catalytic RNAs (Ribozymes)

Plant Metabolic Processes

3 Topics

Mineral Nutrition, Nitrogen Fixation, and Assimilation Sulphur Metabolism and Secondary Plant Metabolites Cell Cycle Regulation and Cellular Stress Physiology

Seed Physiology

2 Topics

Seed Development, Reserve Mobilization, and Desiccation Tolerance Seed Germination, Seed Vigour and Physiological Seed Dormancy

Physiology of Flowering and Reproduction

1 Topic

Photoperiodism, Phytochromes and Floral Induction (Florigen)

Plant Molecular Biology

3 Topics

Molecular Markers and Mapping Populations Plant Gene Expression and Functional Genomics Plant Genome Organization, Organellar DNA, and Cytoplasmic Male Sterility

Plant Biotechnology / Genetic Engineering

3 Topics

Recombinant DNA Technology, Cloning Vectors, and Enzymes Plant Genetic Transformation, Transgenics, and Genome Editing Plant Tissue Culture, Micropropagation, and In Vitro Morphogenesis

Tissue Culture

1 Topic

Haploids, Embryo Rescue, Protoplast Fusion and Germplasm Repositories

Plant Genetic Engineering

2 Topics

Plant Transformation Systems: Agrobacterium T-DNA and Direct Gene Delivery Transgenic Crop Technologies, Biofortification and Trait Engineering

Molecular Markers and Genomics

1 Topic

Molecular Marker Systems, Genetic Diversity and Mapping Populations

Biochemistry- ICAR JRF/SRF 2024

120 Questions Bilingual

RPSC Agriculture Exams

5 Exams

Food Safety Officer Assistant Agriculture Officer Agriculture Officer RPSC Agriculture Research Officer RPSC AARO

RSSB Agriculture Exams

1 Exam

RSSB Agriculture Supervisor

National & PG Entrances

4 Exams

ICAR AIEEA PG CUET UG Rajasthan Agriculture Pre-PG ICAR JRF/SRF