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