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6. Stacks of thylakoid membranes, found in a chloroplast

  • grana
  • sarcolemma
  • lamellae
  • stomata

7. The number of times a cell divides before undergoing apoptosis.

  • Hox cluster
  • Hardy-Weinberg principle
  • Hayflick constant
  • half-life

8. Disorderly, often accidental cell death

  • asepsis
  • necrosis
  • epistasis
  • apoptosis

9. The role a species plays in an ecosystem

  • habitat
  • niche
  • trophic level
  • primary consumer

10. Square frame used for sampling in field work

  • quadrat
  • quadset
  • quadrant
  • quadract

11. Characteristic in which the allele responsible is only expressed in the phenotype if there is no dominant allele present

  • recessive
  • dominant
  • codominance
  • epistasis

12. Cell formed, during sexual reproduction, from the fusion of two gametes

  • embryo
  • fetus
  • zygote
  • podocyte
  • erythrocyte

13. An excretory product formed from the breakdown of excess amino acids

  • carbon dioxide
  • urea
  • ammonia
  • water

14. A line taken through a habitat, which helps with systematic sampling of changes across a habitat.

  • point quadrat
  • transect
  • quadrat
  • belt
  • point

15. A directional growth response in which the direction of the response is determined by the direction of the external stimulus

  • hormones
  • trophic
  • tropism
  • auxin