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