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