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