Which organelle is responsible for producing most of the cell’s energy?, Mitochondria, Ribosome, Nucleus, Golgi apparatus, What process allows materials to move from an area of high concentration to low concentration without energy?, Active transport, Exocytosis, Endocytosis, Diffusion, What is the main function of the cell membrane?, Store DNA, Control what enters and leaves the cell, Provide structure only, Produce proteins, Which of the following represents a recessive genotype?, Aa, AB, bb, AA, What is the probability of offspring having two recessive alleles when both parents are heterozygous (Aa × Aa)?, 50%, 25%, 0%, 75%, DNA is best described as:, A sugar molecule, A type of protein, A lipid, A chemical that stores genetic information, Which statement best describes natural selection?, All organisms evolve at the same rate, Strong organisms survive randomly, Traits that improve survival are more likely to be passed on, Organisms change because they want to, Fossils provide evidence for evolution because they:, Show changes in species over time, Prevent extinction, Only form in water, Show current organisms only, Which level of organization includes all living and nonliving things in an area?, Population, Organism, Community, Ecosystem, What role do producers play in an ecosystem?, Break down dead organisms, Recycle nutrients, Make their own food using sunlight, Consume other organisms, Which is an example of a biotic factor?, Bacteria, Temperature, Water, Sunlight, Which system is responsible for transporting oxygen and nutrients throughout the body?, Digestive system, Circulatory system, Nervous system, Respiratory system, What is the function of the lungs?, Control movement, Exchange oxygen and carbon dioxide, Pump blood, Break down food, What is the primary source of energy for photosynthesis?, Carbon dioxide, Water, Oxygen, Sunlight, What is one product of cellular respiration?, Glucose, Sunlight, Carbon dioxide, Oxygen, What is the independent variable in an experiment?, The variable that is changed, The measured result, The constant factor, The conclusion, Why is it important to have a control group?, To change variables, To compare results, To add bias, To increase experiment time.

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