Lecture 1

Question 1

To be considered as living, an organism must:

Answer 1

• transform energy
• maintain homeostasis
• reproduction

Question 2

What is energy transformation?

Answer 2

• cellular work - chemical reaction (metabolism)
• fuelled by ATP (made from cellular respiration)
• transform energy into new molecules

Question 3

Three source of energy:

Answer 3

• inorganic molecules
• organic molecules
• light

Question 4

Autotroph

Answer 4

• make organic molecules from inorganic molecules + outside E
  Photoautotroph : light + CO2 = glucose
  Chemoautotroph: chemical E + CO2 = glucose

Question 5

Heterotroph

Answer 5

Chemohetetroph: consume organic molecules as both E & C source and make it into other carbon molecules
Photoheterotroph: consume light as E source and obtain C from food