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