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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