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