BIOLOGY 1P03 Lecture Notes - Lecture 2: Habitat Destruction, Atomic Number, Carbon
8 Sep 2016
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Chapter 1: An Introduction to Life on Earth Continued
• Fig E1-2
o The experiment of Malte Anderson
• Control – groups control for variables so that they remain constant.
• Variables – are factors which may impact the outcome of an experiment.
• Fig 1-13
o Adaptations in Lupine Flowers
▪ Pollen is forced into the bee's abdomen
• When Poor Logging Practices happen it results in soil erosion and habitat destruction.
Why is BIODIVERSITY being THREATENED?
• Biodiversity is the variety of species in the world and the interrelationships that sustain them.
• Human activities have severely reduced habitats for these interrelationships.
• Extinctions have followed from the growth of human populations.
Atoms, Molecules, Life, and Supplementary Information
• Atom – smallest possible unit of matter, which maintains the chemical and physical properties of its
element.
o Sub-Atomic Particles
▪ Proton – has one unit of positive charge, protons are in the nucleus.
▪ Neutron – has no charge (electrically neutral), neutrons are in the nucleus.
▪ Electron – has one unit of negative charge, electrons are in the surrounding orbitals.
• Table 2-2
o Mass and Charge of Subatomic Particles
Subatomic Particle
Mass (In atomic mass units)
Charge
Neutron (n)
1
0
Proton (p+)
1
+1
Electron (e-)
0.00055
-1
• Fig 2-1
o Atomic Models
• Element – is composed of aoms; is a substance, which cannot be broken down ino other substances by
chemical reactions.
• Table 2-1
o Common Elements in Living Organisms.
Element
Atomic Number1
Mass Number2
% by weight in the
human body
Oxygen (O)
8
16
65.0
Carbon (C)
6
12
18.5
Hydrogen (H)
1
1
9.5
Nitrogen (N)
7
14
3.0
Calcium (Ca)
20
40
1.5
Phosphorus (P)
15
31
1.0
Potassium (K)
19
39
0.35
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Document Summary
Chapter 1: an introduction to life on earth continued. Fig e1-2: the experiment of malte anderson. Control groups control for variables so that they remain constant: variables are factors which may impact the outcome of an experiment. Pollen is forced into the bee"s abdomen: when poor logging practices happen it results in soil erosion and habitat destruction. Why is biodiversity being threatened: biodiversity is the variety of species in the world and the interrelationships that sustain them, human activities have severely reduced habitats for these interrelationships. Extinctions have followed from the growth of human populations. Atoms, molecules, life, and supplementary information: atom smallest possible unit of matter, which maintains the chemical and physical properties of its element. Proton has one unit of positive charge, protons are in the nucleus: neutron has no charge (electrically neutral), neutrons are in the nucleus. Electron has one unit of negative charge, electrons are in the surrounding orbitals.
