MCQs Biology-15 Posted on November 27, 2025November 27, 2025Author agropublishers 0 MCQs Biology-15 1. The small intestine is segmented into the duodenum, jejunum, and ileum, in which———— All parts perform equal functions Jejunum is mainly secretory Ileum absorbs bile salts and vitamin B12 Duodenum is primarily absorptive 2. DNA-binding proteins typically recognize ———— Minor groove Phosphate backbone Both grooves equally Major groove 3. Adenine pairs with thymine through ———— One hydrogen bond Two hydrogen bonds Three hydrogen bonds Ionic bonds 4. Which term describes a species that no longer exists? Transitional species Endangered species Fossil species Extinct species 5. Synaptonemal complex, which forms between homologous chromosomes during prophase I of meiosis, is mainly composed of ———- Proteins Lipids RNA DNA 6. The structural unit of compact bone in humans is ——- Canaliculus Haversian canal Trabecula Osteon 7. Genetic drift refers to ——– Selection of the best traits Random changes in allele frequencies Use and disuse of organs Mutations only 8. Chromosomes become visible under a light microscope during ———- Interphase Metaphase only Telophase Prophase 9. The structure of DNA is best described as a —— Branched chain Double helix Triple helix Single strand 10. __________ is an acellular organism that completely lacks a nucleus and other organelles Virus Fungi Algae Bacteria Loading … Question 1 of 10
