MCQs Biology-20 Posted on November 27, 2025December 3, 2025Author agropublishers 0 MCQs Biology-20 1. Microscopic gaps between the endings of one neuron and another cell are called__________ Transmitters Nodes Synapses Pores 2. Recombinant DNA technology is primarily used in ———– Ecosystem monitoring Anatomy studies Fossil analysis Molecular cloning 3. A protoplast is best defined as _____________ The plasma membrane and all cellular contents it surrounds A plant cell, after removing its cell wall, containing the plasma membrane and all cellular contents it surrounds The living part of a cell, including the cytoplasm and nucleus A plant cell with its cell wall removed 4. The discovery of mustard gas as a mutagen was significant because it showed that __________. Mutations could not be induced artificially Mutations were always lethal Chemicals could also induce heritable genetic changes Radiation was the only mutagenic agent 5. Toxicology studies ———– DNA replication Protein synthesis Beneficial chemicals Harmful effects of chemicals on organisms 6. Rhizobium is an example of ———–bacteria Parasitic Symbiotic nitrogen-fixing Chemosynthetic Saprophytic 7. Which example cannot describe a sample? 25 students chosen randomly 105 plants chosen from a field 12 leaves measured from one tree All plants in the field 8. The number of crossovers per bivalent depends on ——– Centriole number Chromosome size Cytoplasmic volume Cell size Loading … Question 1 of 8
