quiz 3 Flashcards
What did earth early atmosphere consist of?
water vapor, nitrogen gas, carbon dioxide, hydrogen gas, methane gas
What’s a protocell?
it was a lipid-protein membrane cell like structure that carried on energy metabolism. The first precursor to the first true cell.
What’s the heterotroph hypothesis?
The concept that the first living organisms in the oceans was a heterotroph that simply ate the organic molecules in the oceans
What are autotrophs?
1st chemosynthesis: bacteria like organisms that made with chemicals as the energy source
2nd photosynthesis: these early algae like organisms that made food using light as an energy source. They released 02 into the atmosphere.
What are plants?
Eucaryotic, multicellular autotrophs, nonmotile, alternation of generation. Ex: tulips, tomatoes, maple tree, corn
What’s are animal?
Eucaryotic, multicellular, heterotrophs, motile, sexual reproduction.
Ex: horses, elephants, worms, fish
What is fungi?
Eucaryotic, multicellular, heterotrophs, motile, sexual
Ex: mushrooms, toadstools and molds
What are protist?
Eucaryotic, unicellular or multicellular, heterotrophs, asexual, sexual
Ex: paramecium, amoeba
What is evolution?
The process by which life has through time.
What is fossils?
the remains and traces of past life such as trails, footprints, burrows, persevered droppings, shells, bones teeth, etc
What period did dinosaurs become extinct?
The cretaceous period
What was the hardy weinberg principles
No mutations
no genetic drift
no gene flow
random mating
no selection
What are mutations?
Changes in the gene makeup during production of sex cells- sudden and permanent change in chromosomes during the production of sex cells will effect the offspring only
What is natural selection?
Process by which populations become adapted to their environment
Who is charles darwin?
Naturalist and father of evolution: Author of origin of species by means of natural selection
What’s the three types of natural selection?
Stabilizing selection
direction selection
disruptive selection
What is stabilizing selection
individuals with characteristics near average range are favored. Extreme characteristics (highest or lowest) usually are not favored
What is directional selection
changes in the environment can cause an extreme phenotype to be favored
What is Disruptive selection
Two or more extreme phenotypes are favored over average phenotypes depending on the environment (forest versus grassland or snails can live in different environments)
What’s a genotype?
Genes (Dna)
What’s a phenotype
Physical characteristics
