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