Bio Exam 3 Class 2 (Protists) Flashcards
what is primary endosymbiosis?
when an anceient protist engulfed a cynobacteria
what is secodary endosymbiosis
when a protist engulfs a protist that already had a chloroplast
endosymbiosis does not account for the origin of..
the nucleus
how did the er and nuclear membrane form?
the outer membrane infolded inward and made the ER and made the nucleus
what is the evidence for the nuclear membrane infolding to form the nucleus?
NM and ER are continuous
what did the infoldings of the nucleus do?
it separated transcription and translation (better allows for gene enscription
many but not all protists have elaborate
cells walls and shells
amoeboid protists (unicellular) lack
elaborate cell walls
what was the greatest innovation for protists?
multicellularity
what did multicellularity allow cells to do?
specialize for different functions, and increase in size
what is another major innovation in protists
the development of sexual reproduction
what are the advantages for asexual reproduction?
- you know what you are going to get
- can reproduce faster
- “cheaper”
- dont waste time looking for a mate
what are advantages about sexual reproduction
- swapping genes allows for variable phenotypes
- less susceptible to pathogens
- variability allows for a higher chance of success
- fewer clones to compete for resources (less offspring)
protists can either reproduce asexually through… or sexually though…
mitosis,,, meiosis
protists can be predominately… or …..
haploid or diploid