BIO 220 BYU EXAM 1 STUDY GUIDE QUESTIONS WITH
COMPLETE SOLUTIONS
How old is earth? -- Answer ✔✔ 4.6 billion
What are the earliest fossils? And how old are they? -- Answer ✔✔ Stromatolites (blue-
green algae)
They are 3.5 billion years old
What is significant about the cambrian explosion? -- Answer ✔✔ It lead to all the body
types we have today.
The number of species on earth expanded immensely
What does the Origin of Species discuss? -- Answer ✔✔ 1. Descent with modification
produces nested hierarchy of relationships
2. Natural selection is a mechanism for change in natural populations
What are the characteristics of a metazoan? -- Answer ✔✔ Metazoan=animal
1. Eukaryotic
2. Multicellular
, 3. Fixed Body Plan
4. Motile
5. Heterotrophic
Holocene Mass Extinction -- Answer ✔✔ Caused by humans.
-climate change
-habitat loss
-ocean acidification
-deforestation
What is a protist?
How did they come about?
How do they feed? -- Answer ✔✔ -Single cell eukaryote
-Symbiogenesis(endosymbiosis)
-via phagocytosis/intercellular digestion
How do cilia and flagella work? -- Answer ✔✔ -Cilia have a power stroke and recovery
stroke like a rowboat
-Flagella act like a propeller of a plane and pull the critter through the water. (the
doublets flex in sequence to create the propeller motion)
Dyein arms of flagellum? -- Answer ✔✔ They do all of the pulling on the doublet
adjacent to it
COMPLETE SOLUTIONS
How old is earth? -- Answer ✔✔ 4.6 billion
What are the earliest fossils? And how old are they? -- Answer ✔✔ Stromatolites (blue-
green algae)
They are 3.5 billion years old
What is significant about the cambrian explosion? -- Answer ✔✔ It lead to all the body
types we have today.
The number of species on earth expanded immensely
What does the Origin of Species discuss? -- Answer ✔✔ 1. Descent with modification
produces nested hierarchy of relationships
2. Natural selection is a mechanism for change in natural populations
What are the characteristics of a metazoan? -- Answer ✔✔ Metazoan=animal
1. Eukaryotic
2. Multicellular
, 3. Fixed Body Plan
4. Motile
5. Heterotrophic
Holocene Mass Extinction -- Answer ✔✔ Caused by humans.
-climate change
-habitat loss
-ocean acidification
-deforestation
What is a protist?
How did they come about?
How do they feed? -- Answer ✔✔ -Single cell eukaryote
-Symbiogenesis(endosymbiosis)
-via phagocytosis/intercellular digestion
How do cilia and flagella work? -- Answer ✔✔ -Cilia have a power stroke and recovery
stroke like a rowboat
-Flagella act like a propeller of a plane and pull the critter through the water. (the
doublets flex in sequence to create the propeller motion)
Dyein arms of flagellum? -- Answer ✔✔ They do all of the pulling on the doublet
adjacent to it
