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Practice Test 53 - High School Biology

20 questions. Answer them in any order, then submit to see your score and every explanation.

  1. A wolf pack is observed hunting elk. Two wolves chase the elk from behind while three others spread out ahead to cut off escape routes, forcing the elk toward a narrow gap where another wolf waits. In the same area, a lone wolf hunting elk succeeds about 10% of the time, while packs succeed about 30% of the time. Which statement best explains the benefit of this cooperative behavior?
  2. Which statement correctly compares the chemical energy in glucose and the chemical energy in ATP in a cell?
  3. Homeostasis is often described as involving three parts: a sensor (receptor), a control center, and an effector. Which option correctly matches these parts to their roles in maintaining a stable internal condition (such as temperature)?
  4. A species of starfish can reproduce when a piece breaks off and grows into a complete new starfish. The new starfish has the same genetic information as the original starfish. Which feature most strongly indicates this is asexual reproduction?
  5. A fertilized egg begins as one cell and later becomes a multicellular organism with many different tissues. Which description best explains how both cell division and differentiation contribute to this change?
  6. A gene has the coding DNA sequence ATG TTT CCA GGC. A mutation inserts one base after the first three bases, producing ATG A TTT CCA GGC (an insertion of A after ATG). Which is the best prediction about the protein produced?
  7. A bird population is monitored for average wing length (cm) as a new storm pattern becomes common. Strong storms favor birds that can maneuver quickly in dense vegetation. Wing length (mean): 2001: 12.4 2003: 12.1 2005: 11.8 2007: 11.6 2009: 11.5 Which interpretation best describes the trend direction and what it suggests?
  8. A stem cell divides, and the two daughter cells end up in different parts of a developing tissue. One becomes a nerve cell and the other becomes a muscle cell. Both cells have the same DNA. What is the most likely reason they become different cell types?
  9. In a certain plant, the gene for seed shape has two alleles: R (round, dominant) and r (wrinkled, recessive). A round-seeded plant could have genotype RR or Rr. What best explains why two different genotypes can produce the same phenotype?
  10. In a fish population, some individuals have a heritable body color that is better camouflage against predators on dark rocks, while others are lighter and more visible. Predators eat more visible fish. After many generations on dark rocks, more fish are dark-colored. Which statement best describes what evolved?
  11. A population of bacteria contains heritable variation: most cells are susceptible to Antibiotic X, but a few have a mutation that makes them resistant. A patient takes Antibiotic X for several days. After treatment, most susceptible bacteria die, while resistant bacteria survive and reproduce. After multiple rounds of treatment and reproduction, the bacterial population is mostly resistant. Which option best explains this change by natural selection?
  12. A line of ants finds a large dead insect. Some ants lay a pheromone trail back to the nest, and many nestmates follow the trail to the food. Several ants work together to drag the insect, which is too heavy for one ant to move. Which choice best describes why this is cooperative behavior?
  13. A student writes this model for deforestation impacts: [Logging] → [Fewer trees] → [Animals lose nesting sites] → [Population decline] → [Higher extinction risk] → [Lower biodiversity]. What is the best interpretation of what the arrows represent in this model?
  14. A histogram (described in words) shows shell length in a snail population. Most snails are between 15–20 mm, fewer are 10–15 mm, and very few are 20–25 mm. The overall range is 10–25 mm. Which description best matches this distribution?
  15. In a meadow ecosystem, sunlight shines on grass. A rabbit eats the grass, and a fox eats the rabbit. After organisms die, fungi and bacteria break down the dead material. Which statement best explains why producers are essential in this ecosystem?
  16. In a grassland, grasses photosynthesize and build biomass. Grasshoppers eat grass, frogs eat grasshoppers, and snakes eat frogs. When organisms die, fungi and bacteria break down the dead matter. Which statement best describes the role of decomposers in this ecosystem?
  17. Two groups of the same fish species were measured for body length (cm). Group 1 (n=8): 12, 13, 13, 14, 14, 15, 15, 16 Group 2 (n=8): 10, 12, 12, 14, 16, 18, 18, 20 Which group has the greater variation in body length (based on range)?
  18. A food chain follows the 10% rule. Primary consumers have 3,200 kcal and secondary consumers have 320 kcal. How much energy is lost from primary consumers to secondary consumers?
  19. A school of small fish swims tightly together when a larger predator approaches. Compared with a solitary fish, what is one major advantage of schooling that increases an individual fish's chance of surviving an attack?
  20. Two plants are clones (genetically identical). Plant A is grown with plenty of nitrogen fertilizer and reaches 150 cm tall. Plant B is grown in the same light and water but without nitrogen fertilizer and reaches 80 cm tall. What is the best conclusion?

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