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