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