Bio-148 Unit 7 Exam Questions With
All Correct Answers Verified Answers
2025 Marking Scheme New Update
Population - Answer- A group of individual from the same species living in the same
geographical area
Community - Answer- An interacting group of different species that live in a common
area
Ecosystem - Answer- Interaction of a community of organisms with their environment
Trophic level - Answer- Each of several hierarchical levels in an ecosystem, comprising
organisms that share the same function in the food chain and the same nutritional
relationship tp the primary sources of energy
Producer - Answer- Organisms in an ecosystem that produce biomass from inorganic
compounds (autotrophs)
Primary consumer - Answer- Organisms that eat producers (herbivores)
Secondary consumer - Answer- Organism that eats primary consumers (carnivores and
omnivores)
Tertiary consumer - Answer- An organism that feeds on secondary consumers
Decomposer - Answer- An organism that feeds on detritus and chemically decomposes
organic material.
Gram positive - Answer- Describing bacteria that look purple when treated with a gram
stain. These bacteria have cell walls composed of a thick layer of peptidoglycan.
Gram negative - Answer- Describing bacteria that look pink when treated with a gram
stain. These have an outer layer over the peptidoglycan which is also very thin.
Binary fission - Answer- Asexual reproduction used by prokaryotes, used to produce
two identical cells from one cell.
Cyanobacteria - Answer- A lineage of photosynthetic bacteria formerly known as blue-
green algae. Likely the first life-forms to carry out oxygenic photosynthesis.
Extremophile - Answer- Bacterium or Archean that thrives in an extreme environment
All Correct Answers Verified Answers
2025 Marking Scheme New Update
Population - Answer- A group of individual from the same species living in the same
geographical area
Community - Answer- An interacting group of different species that live in a common
area
Ecosystem - Answer- Interaction of a community of organisms with their environment
Trophic level - Answer- Each of several hierarchical levels in an ecosystem, comprising
organisms that share the same function in the food chain and the same nutritional
relationship tp the primary sources of energy
Producer - Answer- Organisms in an ecosystem that produce biomass from inorganic
compounds (autotrophs)
Primary consumer - Answer- Organisms that eat producers (herbivores)
Secondary consumer - Answer- Organism that eats primary consumers (carnivores and
omnivores)
Tertiary consumer - Answer- An organism that feeds on secondary consumers
Decomposer - Answer- An organism that feeds on detritus and chemically decomposes
organic material.
Gram positive - Answer- Describing bacteria that look purple when treated with a gram
stain. These bacteria have cell walls composed of a thick layer of peptidoglycan.
Gram negative - Answer- Describing bacteria that look pink when treated with a gram
stain. These have an outer layer over the peptidoglycan which is also very thin.
Binary fission - Answer- Asexual reproduction used by prokaryotes, used to produce
two identical cells from one cell.
Cyanobacteria - Answer- A lineage of photosynthetic bacteria formerly known as blue-
green algae. Likely the first life-forms to carry out oxygenic photosynthesis.
Extremophile - Answer- Bacterium or Archean that thrives in an extreme environment
