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Exam (elaborations)

PNB 2250 Exam 1 Questions and Correct Answers | Latest Update

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  • Module
  • PNB 2250
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  • PNB 2250

What traits to animals share? -:- Eukaryotic, heterotrophic, able to move Cell to cell connections in plants -:- Plasmodesmo, flow of nutrients between cells Cell to cell connections animals -:- Tight junctions, strong connection Some multicellularity advantages -:- Cells have dedicated ...

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  • September 17, 2024
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  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • PNB 2250
  • PNB 2250
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2024 /2025 | © copyright | This work may not be copied for profit gain | Excel!




PNB 2250 Exam 1 Questions and Correct
Answers | Latest Update
What traits to animals share?


✓ -:- Eukaryotic, heterotrophic, able to move




Cell to cell connections in plants


✓ -:- Plasmodesmo, flow of nutrients between cells




Cell to cell connections animals


✓ -:- Tight junctions, strong connection




Some multicellularity advantages


✓ -:- Cells have dedicated tasks (increase efficiency)

Not all genes expressed (saves energy)


Cells are further away from surface, ease on homeostasis




Disadvantage of multicellularity


✓ -:- Need special cell/cell connections

1|P a g e | G r a d e A + | 2 0 2 0 2 5

,2024 /2025 | © copyright | This work may not be copied for profit gain | Excel!



Need for cell/cell communication


Need system for distribution of nutrients




Reason cells/tissues are different


✓ -:- because the genes are expressed differently, muscle tissues are

different than skeletal tissues because of gene expression




Why is the fossil record incomplete?


✓ -:- Needs to die near water, fossilization process needs to be in a

situation where there's no oxygen present, rapidly covered in soil so

overtime the soil compresses them and forms rock




Earth also continues to move, easier to find fossils closer to the earths crust, older fossils

are being pushed deep and deeper into the crust




Chanoflagelletes


✓ -:- around 665 million years old, not an animal but is considered an

ancestor to animals. They have cell adhesion, cell signaling and animal

specific genes


2|P a g e | G r a d e A + | 2 0 2 0 2 5

, 2024 /2025 | © copyright | This work may not be copied for profit gain | Excel!




Anagenesis


✓ -:- species formation without branching of the evolutionary line of

descent.




How do animals evolve?


✓ -:- 1. Heritable traits

2. Speciationm anagenesis, extinction


3. Adaptations to changing enivornments


- Different solutions to the same problems


- Change can be rapid




covergent evolution


✓ -:- when structures look the same and share a common function but

are not derived from a common ancestor, think of falcon (bird) , bats

(mammal, pteridactyl (reptile)




PROOF THAT: limited possible solutions to problems faced by problems, evolution drives

these animals to the final solution

3|P a g e | G r a d e A + | 2 0 2 0 2 5

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