1) Which bacterial feature is the best antibiotic target to avoid damaging human cells? a) Ribosomes that resemble human ribosomes b) DNA stored in the cytoplasm c) Peptidoglycan cell wall d) Plasma membrane 2) Another sample organism from the same pond was observed to ingest food particles by surrounding them with its membrane (phagocytosis). What type of organism is this most likely to be? a) Virus b) Amoeba c) Bacterium d) Yeast 3) A patient’s cells fail to pass a mitotic checkpoint. What happens? a) The cell repairs damage before dividing b) The cell skips mitosis completely c) The chromosomes do not replicate d) The cell continues dividing uncontrollably 4) After testing, it was observed that the organism lacks a nucleus and membrane-bound organelles. What type of organism is it? a) Fungi b) Bacterium c) Protist d) Plant cell 5) After synthesis, the enzymes are modified, packaged, and sorted before transport. Which organelle performs this function? a) Golgi Apparatus b) Lysosome c) Rough Endoplasmic Reticulum d) Ribosome 6) Why do nerve and muscle cells rely heavily on the sodium-potassium pump during exercise? a) To maintain action potentials for signals and contractions b) To block glucose from leaving the cell c) To make ATP directly from sodium ions d) To prevent oxygen from diffusing in 7) A cell from a body builder would most likely have high amounts of ____ a) Lysosomes b) Golgi Bodies c) Mitochondria d) Ribosomes 8) When blood sugar levels rise after eating, the pancreas releases insulin to help cells absorb glucose and restore balance. Which characteristic of life is being demonstrated in this process? a) Reproduction b) Adaptation c) Homeostasis d) Organization 9) Why must chromosomes separate correctly in mitosis? a) To speed up wound healing b) To make new cells larger than the old ones c) To help white blood cells detect infection d) To ensure each new cell gets a complete set of DNA 10) A child is born with Turner Syndrome (XO). What genetic event caused this? a) Nondisjunction of sex chromosomes b) Overproduction of ribosomes c) Mutation in mitochondrial DNA d) Extra replication of autosomes 11) If the enzymes never reach their destination, which organelle will fail to break down cellular waste? a) Nucleus b) Lysosome c) Rough Endoplasmic Reticulum d) Ribosome 12) A researcher develops a drug that strengthens the p53 protein, which stops division when DNA is damaged. What effect will this drug most likely have? a) Faster mitosis b) Increased apoptosis of abnormal cells c) More uncontrolled growth d) Extra chromosome replication 13) Polar bears in the Arctic have thick fur and a layer of fat that allow them to survive freezing temperatures. Climate change is causing sea ice to melt, reducing their hunting grounds. Which characteristic of life is shown by the polar bear’s thick fur, and what challenge may affect this in the future? a) Reproduction b) Adaptation c) Homeostasis d) Organization 14) A biologist discovers a microscopic organism in pond water. It is brought to the laboratory for further examination. As the first step, what should the biologist check to determine if the organism is prokaryotic or eukaryotic? a) Presence of a nucleus b) Shape of the cell c) Method of reproduction d) Color of the cytoplasm 15) A microbiologist is comparing a bacterial cell and a plant cell under the microscope. Both have cell walls, but their composition and functions differ significantly. What is the main component of the bacterial cell wall that is targeted by antibiotics like penicillin? a) Cellulose b) Peptidoglycan c) Lignin d) Chitin 16) A geneticist is investigating a rare disease where a patient’s cells fail to produce functional digestive enzymes. Lab results show that the enzymes are made in the cell but never reach the lysosome, causing toxic buildup. Which organelle is responsible for synthesizing the digestive enzymes in the first place? a) Smooth Endoplasmic Reticulum b) Rough Endoplasmic Reticulum c) Golgi Apparatus d) Lysosome 17) A new medicine is designed to regulate skin cell mitosis during wound healing. In trials, patients healed normally without forming keloids. Which best explains the drug’s effect? a) It stopped mitosis completely. b) It allowed mitosis but controlled its timing. c) It blocked chromosome replication. d) It triggered inflammation instead of repair. 18) Which among the following is NOT considered a living organism? a) Protists b) Virus c) Bacteria d) Fungi 19) If ATP is blocked in pancreatic cells, insulin secretion stops. Why? a) Exocytosis requires ATP for vesicle release b) Osmosis cannot occur without ATP c) Diffusion needs ATP to transport glucose d) Mitosis produces insulin without ATP 20) When scientists examined onion skin under the microscope, they saw it was made up of repeating rectangular units with nuclei and cell walls. Which characteristic of life does this observation show? a) Cell Organization b) Growth c) Adaptation d) Response to Stimuli 21) Which among the following determines the trait of the organism in DNA? a) Amount of adenine b) Sequence of nitrogen bases c) Number of sugars d) Strength of hydrogen bonds 22) Which cells would result in new cells that are most different from the parent cell? a) Yeast cells undergoing binary fission b) Skin cells undergoing mitosis c) Bacterial cells dividing into new cells d) Sperm and egg cells uniting to form a zygote 23) A red blood cell is placed in distilled water. Over time, it bursts. What process caused this? a) Active transport b) Facilitated diffusion c) Osmosis d) Endocytosis 24) A plant biologist is studying how certain plant cells survive and function under different environmental conditions. The focus is on how they produce proteins, store water, and maintain structural support. Which cell structure is responsible for making proteins that the plant cell needs for growth? a) Mitochondrion b) Ribosome c) Cell Wall d) Vacuole 25) The medulla part of the brainstem reacts quickly to increased levels of CO2 in the blood and stimulates a response from ___________. a) Circulatory System b) Immune System c) Integumentary System d) Respiratory System 26) Why does the risk of Down Syndrome increase with maternal age? a) Chromosome separation during meiosis weakens b) Older mothers copy DNA too often c) older mothers produce more eggs d) DNA repair mechanisms disappear 27) During a drought, which organelle in the plant cell plays the biggest role in storing water and maintaining internal pressure? a) Mitochondrion b) Ribosome c) Cell Wall d) Vacuole 28) Which statement best differentiates photosynthesis from cellular respiration? a) Photosynthesis creates glucose, respiration uses CO2 b) Photosynthesis occurs in plants; cellular respiration only occurs in animals c) Photosynthesis uses light energy to create ATP; cellular respiration deduces ATP from macromolecules d) Photosynthesis uses sun’s energy to convert CO2 and H2O; respiration breaks down energy rich molecules to accumulate ATP 29) A medical researcher is studying Streptococcus pneumoniae, a bacterium that causes pneumonia. A new antibiotic is being developed to target features unique to bacterial cells while leaving human cells unharmed. What main feature distinguishes Streptococcus pneumoniae from human cells? a) It contains DNA and RNA. b) It has mitochondria for energy. c) It lacks a membrane-bound nucleus. d) It performs cellular respiration. 30) A diabetic patient’s cells cannot absorb glucose because insulin secretion fails. Which process is affected? a) Exocytosis of insulin vesicles b) Osmosis of water c) Diffusion of oxygen d) Endocytosis of sodium

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