Introduction Unit

Question 1

What are the 5 unifying themes of life

Answer 1

1. Organization
2. Information
3. Matter & Energy
4. Interactions
5. Evolution

Question 2

Orginization is based on the heirarchy of structure. In what order does the heirarchy go

Answer 2

• Atoms
• Molecules
• Organelles
• Cells
• Tissues
• Organs
• Organ system
• Organism
• Population
• Community
• Ecosystem

Question 3

What are the 4 properties required for life

Answer 3

1. Reproduce
2. Uptake / process nutrients
3. Excrete waste
4. Respond to stimuli

Remember with the acronym ‘RUER’

Question 4

What are 3 main differences between bacteria and viruses

Answer 4

Bacteria:
- Unicellular
- Structure of a cell
- Reproduce through binary fission
Virus:
- No cells
- Structure of DNA / RNA in protein coat
- Reproduce through invading host cell

Question 5

What is a positive feedback loop

Answer 5

The production of products will lead to increase production of products

This will eventually lead to negative feedback

Question 6

What is a negative feedback loop

Answer 6

The accumulation of an end product slows down / halts production of end product

Question 7

What are 5 main points of darwin’s theory of evolution

Answer 7

1. There is variation within population
2. Some variations are favorable
3. More young are produced than can survive in each generation
4. Those that survive and reproduce have favorable variation
5. Over time, small changes accumulate, resulting in speciation

Question 8

What is the phylogeneic tree

Answer 8

The representation of evolutionary relationships through → domain, kingdom, phyllum, class, order, family, genus, species