BSC 1005 Exam 4 questions with verified answers
- 5 million - 30 million species on earth
- only 1.5 million formally described Ans✓✓✓
- for plants to flourish on land they had to evolve adaptations for life in
a dire environment
- vascular tissue
- pollen and seeds Ans✓✓✓
1.2 billion years ago... Ans✓✓✓ - first multicellular eukaryotic
organisms were green algae
- marine invertebrates arrived 600 million years ago (mya).
- diverse ocean animal world in cambrian explosion
- land colonized by primitive plants 450 mya.
- mass extinction 250 mya. (permian extinction)
3.7 billion years ago... Ans✓✓✓ - oldest known fossil
- atmosphere lacked oxygen
- unicellular prokaryotes lived that used other gases as fuel
- Emergence of unicellular photosynthetic organisms 3.0 to 2.5 billion
years ago
- oxygen began to accumulate in the atmosphere
,abiotic factors Ans✓✓✓ nonliving components of environment
adaptive radiation Ans✓✓✓ - survivors spread, diversify and colonize
newly opened habitats
Angiosperms Ans✓✓✓ - seed bearing plants (200 mya)
- seeds produced in fruit
- seeds hold and protect the embryo
- flowers that attract pollinators
- 90% living plants currently
ex: oaks, maples, willows
animals Ans✓✓✓ - multi cellular eukaryotes
- no cell walls
- heterotrophs
- internal digestion
- mobile (food, defense, reproduction)
- three main lineages with distinct body plants (asymmetrical, radial
symmetry, bilateral symmetry)
Animals with bilateral symmetry Ans✓✓✓ - clear right and left halves
- mirror image of each other
- adapted for seeking food and stalking prey and avoiding predators
, ex: lobsters, insects, humans
Animals with radial symmetry Ans✓✓✓ - body plan is circular
- no clear left or right side
ex: jellyfish, sea anemones
antibiotic resistance Ans✓✓✓ - caused by acquiring new alleles in
bacteria
- kills 23,000 people in the US per year
- random mutation
- gene transfer (passing genes between bacteria)
antibiotics Ans✓✓✓ - chemical that kills bacteria
- interfere with the function of essential bacteria cell structures
archaea Ans✓✓✓ - lack of nucleus
- genetically distinct from bacteria
- no peptidoglycan
- DNA protected in heat resistant enzymes
- extremophiles
Arctic amplification Ans✓✓✓ - the Arctic has warmed twice as much as
the rest of the planet
- 5 million - 30 million species on earth
- only 1.5 million formally described Ans✓✓✓
- for plants to flourish on land they had to evolve adaptations for life in
a dire environment
- vascular tissue
- pollen and seeds Ans✓✓✓
1.2 billion years ago... Ans✓✓✓ - first multicellular eukaryotic
organisms were green algae
- marine invertebrates arrived 600 million years ago (mya).
- diverse ocean animal world in cambrian explosion
- land colonized by primitive plants 450 mya.
- mass extinction 250 mya. (permian extinction)
3.7 billion years ago... Ans✓✓✓ - oldest known fossil
- atmosphere lacked oxygen
- unicellular prokaryotes lived that used other gases as fuel
- Emergence of unicellular photosynthetic organisms 3.0 to 2.5 billion
years ago
- oxygen began to accumulate in the atmosphere
,abiotic factors Ans✓✓✓ nonliving components of environment
adaptive radiation Ans✓✓✓ - survivors spread, diversify and colonize
newly opened habitats
Angiosperms Ans✓✓✓ - seed bearing plants (200 mya)
- seeds produced in fruit
- seeds hold and protect the embryo
- flowers that attract pollinators
- 90% living plants currently
ex: oaks, maples, willows
animals Ans✓✓✓ - multi cellular eukaryotes
- no cell walls
- heterotrophs
- internal digestion
- mobile (food, defense, reproduction)
- three main lineages with distinct body plants (asymmetrical, radial
symmetry, bilateral symmetry)
Animals with bilateral symmetry Ans✓✓✓ - clear right and left halves
- mirror image of each other
- adapted for seeking food and stalking prey and avoiding predators
, ex: lobsters, insects, humans
Animals with radial symmetry Ans✓✓✓ - body plan is circular
- no clear left or right side
ex: jellyfish, sea anemones
antibiotic resistance Ans✓✓✓ - caused by acquiring new alleles in
bacteria
- kills 23,000 people in the US per year
- random mutation
- gene transfer (passing genes between bacteria)
antibiotics Ans✓✓✓ - chemical that kills bacteria
- interfere with the function of essential bacteria cell structures
archaea Ans✓✓✓ - lack of nucleus
- genetically distinct from bacteria
- no peptidoglycan
- DNA protected in heat resistant enzymes
- extremophiles
Arctic amplification Ans✓✓✓ - the Arctic has warmed twice as much as
the rest of the planet
