Praxis Science (5005) Domain 2: Life Science Welcome to your Praxis Science (5005) Domain 2: Life Science 1. Praxis Science: Life Science Which of the following best explains the primary role of ribosomes in a eukaryotic cell? A. Synthesis of lipids B. Generation of ATP C. Synthesis of proteins D. Storage of genetic information None 2. Praxis Science: Life Science In a food web, which trophic level is primarily responsible for recycling nutrients back into the ecosystem? A. Producers B. Primary consumers C. Secondary consumers D. Decomposers None 3. Praxis Science: Life Science What is the primary function of xylem in plants? A. Transporting nutrients from the soil B. Conducting water and minerals from the roots to the leaves C. Producing food through photosynthesis D. Transporting sugars from the leaves to the rest of the plant None 4. Praxis Science: Life Science Which process is directly responsible for the variation seen in sexually reproducing organisms? A. Mitosis B. Meiosis C. Binary fission D. Budding None 5. Praxis Science: Life Science In a DNA molecule, adenine ( A. always pairs with which of the following? A) Guanine (G) B. Cytosine ( C. C) Thymine (T) D. Uracil (U) None 6. Praxis Science: Life Science Which type of cell division results in the production of gametes in animals? A. Mitosis B. Meiosis C. Binary fission D. Budding None 7. Praxis Science: Life Science The presence of a keystone species in an ecosystem: A. Has minimal impact on the ecosystem's structure. B. Affects only its direct prey or predator species. C. Plays a critical role in maintaining the structure of the ecosystem. D. Leads to decreased biodiversity within the ecosystem. None 8. Praxis Science: Life Science The primary purpose of stomata in plant leaves is to: A. Absorb light for photosynthesis. B. Provide structural support. C. Facilitate gas exchange and transpiration. D. Store nutrients. None 9. Praxis Science: Life Science Which of the following best describes mutualism? A. A relationship where both species benefit. B. A relationship where one species benefits and the other is harmed. C. A relationship where one species benefits and the other is unaffected. D. A relationship where both species are harmed. None 10. Praxis Science: Life Science What is the primary role of chlorophyll in plants? A. To absorb water and minerals from the soil. B. To protect the plant from herbivores. C. To absorb light energy for photosynthesis. D. To transport sugars throughout the plant. None 11. Praxis Science: Life Science The process by which a tadpole develops into a frog is an example of: A. Metamorphosis. B. Binary fission. C. Budding. D. Fragmentation. None 12. Praxis Science: Life Science Which of the following best describes the primary function of the endocrine system in animals? A. To transport oxygen and nutrients throughout the body. B. To protect the body from pathogens. C. To regulate bodily functions through hormones. D. To provide structural support and facilitate movement. None 13. Praxis Science: Life Science In a typical plant cell, the organelle responsible for converting light energy into chemical energy is the: A. Nucleus B. Chloroplast C. Mitochondria D. Endoplasmic reticulum None 14. Praxis Science: Life Science The process of nitrogen fixation in the nitrogen cycle primarily involves: A. Converting nitrogen gas into usable forms like ammonia by lightning. B. Releasing nitrogen from dead organisms back into the atmosphere. C. Converting atmospheric nitrogen into ammonia by certain bacteria. D. Breaking down nitrogen compounds in the soil to release nitrogen gas. None 15. Praxis Science: Life Science The primary purpose of the waxy cuticle on most plant leaves is to: A. Capture light for photosynthesis. B. Protect the leaf from herbivores. C. Prevent water loss through transpiration. D. Aid in the absorption of carbon dioxide. None 16. Praxis Science: Life Science In animals, the primary function of the lymphatic system is to: A. Produce hormones. B. Regulate body temperature. C. Transport lymph, a fluid containing infection-fighting white blood cells. D. Break down and absorb dietary fats. None 17. Praxis Science: Life Science The principle of competitive exclusion in ecology states that: A. Two species cannot coexist if they occupy the same niche. B. Predators and prey will always maintain a stable population ratio. C. Species diversity is maximized when competition is minimized. D. Mutualistic relationships enhance the survival of competing species. None 18. Praxis Science: Life Science In the water cycle, transpiration refers to: A. Evaporation of water from the surface of oceans and lakes. B. Movement of water from the atmosphere to the ground. C. Release of water vapor from plants into the atmosphere. D. Condensation of water vapor to form clouds. None 19. Praxis Science: Life Science In genetics, the term 'homozygous' refers to: A. Having two different alleles for a particular gene. B. The presence of only one allele for a gene in an organism. C. Having two identical alleles for a particular gene. D. The dominant expression of a gene. None 20. Praxis Science: Life Science A keystone predator in an ecosystem is one that: A. Is at the top of the food chain and has no natural predators. B. Maintains the ecosystem's balance by controlling the population of other species. C. Predominantly preys on the weakest and oldest individuals of other species. D. Is the most numerous predator in the ecosystem. None 1 out of 20 Time is Up! Time's up
