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 Pores Synapses Nodes 2. Which example cannot describe a sample? All plants in the field 105 plants chosen from a field 25 students chosen randomly 12 leaves measured from one tree 3. Rhizobium is an example of ———–bacteria Chemosynthetic Parasitic Symbiotic nitrogen-fixing Saprophytic 4. A protoplast is best defined as _____________ 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 The plasma membrane and all cellular contents it surrounds 5. The discovery of mustard gas as a mutagen was significant because it showed that __________. Radiation was the only mutagenic agent Mutations were always lethal Chemicals could also induce heritable genetic changes Mutations could not be induced artificially 6. Toxicology studies ———– Protein synthesis Harmful effects of chemicals on organisms Beneficial chemicals DNA replication 7. Recombinant DNA technology is primarily used in ———– Molecular cloning Fossil analysis Ecosystem monitoring Anatomy studies 8. The number of crossovers per bivalent depends on ——– Centriole number Cytoplasmic volume Chromosome size Cell size Loading … Question 1 of 8
