Biology MCQ Questions & Answers [PDF Download]
Which enzyme is responsible for unwinding the DNA double helix during replication?
In which phase of mitosis do chromosomes align at the cell's equatorial plane?
What is the primary function of the Calvin cycle in photosynthesis?
Which type of RNA carries amino acids to the ribosome during protein synthesis?
What is the main difference between prokaryotic and eukaryotic gene expression?
Which membrane transport process requires the expenditure of cellular energy (ATP)?
In Mendelian genetics, what phenotypic ratio is expected in the F2 generation of a dihybrid cross?
Which organelle is known as the 'powerhouse of the cell' and contains its own DNA?
What is the term for the maximum number of individuals of a species that an environment can support indefinitely?
Which enzyme is responsible for joining Okazaki fragments during DNA replication?
In which cellular structure does the citric acid cycle (Krebs cycle) take place?
What type of bond holds the two strands of DNA together?
Which process describes the conversion of atmospheric nitrogen into ammonia by bacteria?
What is the primary function of the rough endoplasmic reticulum (RER)?
Which molecule serves as the primary energy currency in cellular metabolism?
In photosynthesis, where are the light-dependent reactions located?
What is the complementary DNA sequence to 5'-ATCGTA-3'?
Which type of inheritance pattern results in both parental traits being expressed simultaneously in heterozygotes?
What is the name of the process by which cells engulf large particles or other cells?
Which hormone regulates blood glucose levels by promoting glucose uptake by cells?
What is the primary role of tRNA synthetases in protein synthesis?
Which structure in plant cells is responsible for maintaining turgor pressure?
What is the term for a mutation that results in a premature stop codon?
Which molecule is the final electron acceptor in aerobic cellular respiration?
What is the function of telomeres in eukaryotic chromosomes?
Which process allows plants to open and close their stomata?
What is the primary function of the CRISPR-Cas9 system in bacteria?
Which type of muscle tissue is found in the walls of blood vessels?
What is the role of ribosomes in the endoplasmic reticulum?
Which ecological principle explains why energy decreases at each trophic level?
What is the primary function of histone proteins in eukaryotic cells?
Which molecule is produced during the light reactions of photosynthesis and used in the Calvin cycle?
What is the significance of the lagging strand in DNA replication?
Which type of selection increases genetic diversity in a population?
What is the primary function of the enzyme catalase in cells?
Which process describes the movement of water through a plant from roots to leaves?