PAX Domain 4: Science Welcome to your PAX Domain 4: Science 1. PAX: Science What is the primary function of ribosomes in a eukaryotic cell? Energy production Lipid synthesis Protein synthesis DNA replication None 2. PAX: Science In which phase of mitosis do the chromosomes align at the cell's equatorial plate? Prophase Metaphase Anaphase Telophase None 3. PAX: Science Which hormone is primarily responsible for the regulation of blood calcium levels? Insulin Thyroxine Parathyroid hormone Adrenaline None 4. PAX: Science The presence of which of the following molecules is most critical for the function of the electron transport chain in cellular respiration? Glucose ATP Oxygen Carbon dioxide None 5. PAX: Science Which of the following blood vessels carries oxygenated blood from the lungs to the heart? Aorta Pulmonary artery Pulmonary vein Vena cava None 6. PAX: Science What is the role of the enzyme catalase in human cells? It synthesizes ATP. It breaks down hydrogen peroxide into water and oxygen. It aids in DNA replication. It facilitates glucose uptake. None 7. PAX: Science Which type of cell junction allows for direct electrical communication between cells in cardiac muscle? Tight junctions Desmosomes Gap junctions Hemidesmosomes None 8. PAX: Science What is the primary function of the lymphatic system in the human body? Oxygen transport Nutrient absorption Immune response coordination Hormone secretion None 9. PAX: Science During which stage of the cell cycle does DNA replication occur? G1 phase S phase G2 phase M phase None 10. PAX: Science What is the term for a solution that has a higher solute concentration than the cytoplasm of a cell, causing the cell to lose water? Isotonic Hypotonic Hypertonic Hypodermic None 11. PAX: Science Which of the following is NOT a function of the skeletal system? Production of blood cells Regulation of body temperature Protection of internal organs Support and structure for the body None 12. PAX: Science In the context of enzyme activity, what does the term 'substrate' refer to? The enzyme's active site The molecule upon which an enzyme acts The product resulting from the reaction The energy required to initiate the reaction None 13. PAX: Science Which part of the brain is primarily responsible for coordinating voluntary muscle movements? Cerebellum Medulla oblongata Hypothalamus Frontal lobe None 14. PAX: Science What is the significance of the 'universal recipient' blood type in blood transfusions? It can donate blood to any blood type. It can receive blood from any blood type without adverse reactions. It lacks all antigens on the red blood cells. It has all possible antibodies in the plasma. None 15. PAX: Science What process describes the movement of water across a semipermeable membrane from an area of low solute concentration to an area of high solute concentration? Diffusion Active transport Osmosis Filtration None 16. PAX: Science In the context of genetics, what is the principle of independent assortment? Genes for different traits are sorted separately from one another so that the inheritance of one trait is not dependent on the inheritance of another. Alleles for the same gene separate from each other during gamete formation. Offspring receive one allele for each gene from each parent. The likelihood of inheriting one trait is the same for all individuals in a population. None 17. PAX: Science Which component of the nervous system is responsible for the 'fight or flight' response? Central nervous system Parasympathetic nervous system Sympathetic nervous system Somatic nervous system None 18. PAX: Science What is the role of myelin in the nervous system? To transmit electrical signals To protect and insulate axons To produce neurotransmitters To regulate ion concentration None 19. PAX: Science Which of the following best describes the role of the mitochondria in cells? They are the site of protein synthesis. They play a key role in the digestion of cellular debris. They generate most of the cell's supply of ATP. They are involved in the modification and packaging of proteins. None 20. PAX: Science What is the primary structure responsible for gas exchange in the lungs? Bronchi Alveoli Trachea Larynx None 1 out of 20 Time is Up! Time's up
