PNB 2250 Exam 1 Latest Questions And Answers 2024/2025 Updates
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PNB 2250
Institution
PNB 2250
PNB 2250 Exam 1 Latest Questions And Answers 2024/2025 Updates
What traits to animal’s share? ANS Eukaryotic, heterotrophic, able to move
Cell to cell connections in plants ANS Plasmodesma, flow of nutrients between cells
Cell to cell connections animals ANS Tight junctions, strong conn...
PNB 2250 Exam 1 Latest Questions And Answers
2024/2025 Updates
What traits to animal’s share? ANS Eukaryotic, heterotrophic, able to move
Cell to cell connections in plants ANS Plasmodesma, flow of nutrients between cells
Cell to cell connections animals ANS Tight junctions, strong connection
Some multicellularity advantages ANS Cells have dedicated tasks (increase efficiency)
Not all genes expressed (saves energy)
Cells are further away from surface, ease on homeostasis
Disadvantage of multicellularity ANS Need special cell/cell connections
Need for cell/cell communication
Need system for distribution of nutrients
Reason cells/tissues are different ANS because the genes are expressed differently, muscle tissues
are different than skeletal tissues because of gene expression
Why is the fossil record incomplete? ANS 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 ANS 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
, Anagenesis ANS species formation without branching of the evolutionary line of descent.
How do animals evolve? ANS 1. Heritable traits
2. Speciationm anagenesis, extinction
3. Adaptations to changing enivornments
- Different solutions to the same problems
- Change can be rapid
covergent evolution ANS 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
what animals must do? ANS - Mechanism for excreting waste
- Mechanism for development and growth
- Energy input
why is immortality impossible? ANS because the universe doesn't have infinite amount of energy
Biochemistry is ANS universal, ATP is used everywhere, DNA/RNA shared
George Wald ANS Prevelance of CHNOPS, 96% of body mass
The chemistry is beneficial to life
Does the presence of an element in the body mean its essential to the body? ANS No, there has to
be a biological property for it to be essential to the animal
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