PNB 2250 Exam 1 Questions With
100% Verified Answers
Animals Traits -
correct answer ✅-distinguish them from plants and single cell
organisms
-eukaryotic, multicellular, complex tissues, differentiated tissues
-heterotrophic: consume living or dead plants or animals
-movement or sessile (stuck to something)
Advantages of Multicellularity -
correct answer ✅1. Cells dedicated to specific tasks, increase in
efficiency
2. Not all genes expressed, saves energy
3. Cells farther away from surface (easier to maintain homeostasis)
***Benefits outweigh cost
Disadvantages of Multicellularity -
correct answer ✅1. Need cell-to-cell connections
2. Need cell-to-cell communication
3. Need system to distribute nutrients
3. Must develop tissues and organs to more effectively regulate
internal and external processes
,PNB 2250 Exam 1 Questions With
100% Verified Answers
Limitations of the Fossil Record -
correct answer ✅1. Loss of soft tissues, loss of DNA
2. Biased-temporal (more recent fossils more likely found),
geographical (movement of Earth hides fossils, and taxonomic
(marine animals fossilized near mud so more marine fossils found)
Is genome size strongly correlated to organism complexity? -
correct answer ✅No- it's how you use the genes you've been given
and which genes are turned on and off
Plants= 25,000 to 60,000 genes
Animals= 19,000 to 30,000 genes
Prokaryotes= 500 to 5,000 genes
Convergent Evolution -
correct answer ✅Def: process by which unrelated organisms
independently evolve similarities (analogous structures) when
adapting to similar environments; shows LIMITED POSSIBLE
SOLUTIONS TO PROBLEMS FACED BY ANIMALS (same mutations can
appear again and again in evolution)
, PNB 2250 Exam 1 Questions With
100% Verified Answers
Examples:
1. Flight in insects- birds and bats
2. Fingerprints- humans and koalas
3. Opposable Thumb- opossums
4. Echolocation- bats, whales, shrews
How does Chemistry and Physics Affect Animal Development and
Physiology? -
correct answer ✅1. Impact on animal form and function
2. All designs have advantages and disadvantages
3. Satisfaction of essential needs (energy input, waste removal,
growth)
How Does Entropy Impact Animal Design? -
correct answer ✅***CHONPS are 96% of body mass
-essential to work against entropy (disorder), stable bonds, allows
you to make proteins, lipids, and carbs, maintain strong structures
resistant to entropy (hard to build but effective)
100% Verified Answers
Animals Traits -
correct answer ✅-distinguish them from plants and single cell
organisms
-eukaryotic, multicellular, complex tissues, differentiated tissues
-heterotrophic: consume living or dead plants or animals
-movement or sessile (stuck to something)
Advantages of Multicellularity -
correct answer ✅1. Cells dedicated to specific tasks, increase in
efficiency
2. Not all genes expressed, saves energy
3. Cells farther away from surface (easier to maintain homeostasis)
***Benefits outweigh cost
Disadvantages of Multicellularity -
correct answer ✅1. Need cell-to-cell connections
2. Need cell-to-cell communication
3. Need system to distribute nutrients
3. Must develop tissues and organs to more effectively regulate
internal and external processes
,PNB 2250 Exam 1 Questions With
100% Verified Answers
Limitations of the Fossil Record -
correct answer ✅1. Loss of soft tissues, loss of DNA
2. Biased-temporal (more recent fossils more likely found),
geographical (movement of Earth hides fossils, and taxonomic
(marine animals fossilized near mud so more marine fossils found)
Is genome size strongly correlated to organism complexity? -
correct answer ✅No- it's how you use the genes you've been given
and which genes are turned on and off
Plants= 25,000 to 60,000 genes
Animals= 19,000 to 30,000 genes
Prokaryotes= 500 to 5,000 genes
Convergent Evolution -
correct answer ✅Def: process by which unrelated organisms
independently evolve similarities (analogous structures) when
adapting to similar environments; shows LIMITED POSSIBLE
SOLUTIONS TO PROBLEMS FACED BY ANIMALS (same mutations can
appear again and again in evolution)
, PNB 2250 Exam 1 Questions With
100% Verified Answers
Examples:
1. Flight in insects- birds and bats
2. Fingerprints- humans and koalas
3. Opposable Thumb- opossums
4. Echolocation- bats, whales, shrews
How does Chemistry and Physics Affect Animal Development and
Physiology? -
correct answer ✅1. Impact on animal form and function
2. All designs have advantages and disadvantages
3. Satisfaction of essential needs (energy input, waste removal,
growth)
How Does Entropy Impact Animal Design? -
correct answer ✅***CHONPS are 96% of body mass
-essential to work against entropy (disorder), stable bonds, allows
you to make proteins, lipids, and carbs, maintain strong structures
resistant to entropy (hard to build but effective)
