BIO UNIT 1 Section 1
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The 5 Characteristics of Life are
Are viruses considered to be living?
Study of modern Biology developed around two great theories:
1.The cell theory
- 2.The theory of evolution by
- natural selection
2 important aspects to a scientific theory:
- 1:If you add any new evidence, it supports the
- 2:It allows you to make predictions based on the
Most theories have two components, which are:
Pattern & Process
The 2 main cell types are:
Don't have a nucleus, Smaller and lack organelles
have a Nucleus, Have memberain organels and are larger
Atoms bond together to make
Nucleus consist of:
Protons (+) and neutrons (0)
What is orbiting the nucleus?
Atomic Number is?
Number of protons in an atom.
Mass Number is?
Protons + Neutrons
The Elements of Life are:
Carbon (C), Hydrogen (H), Nitrogen (N), Oxygen (O), Phosphorous (P), & Sulfer (S): CHNOPS.
Electrons move around the nucleus in
pairs that can hold 2 electrons
Orbitals are grouped into
Valence electrons are:
Reactive elements have outer electron shells whose orbitals are not filled
Reactive atoms become stable by
- chemical Bonds with
- other reactive atoms.
Unpaired electrons are one between
elements, This is what kind of bond?
One atom loses an unpaired electron and another element gains an electron to fill orbital is what kind of bond?
Two atoms share electrons EQUALLY
No partial charge on either atom are what kind of covalent bonds?
One atom more electro negative and pulls electron closer to its nucleus
sharing leads to partial (δ) +/-charges
is what kind of covalent bond?
Why are some molecules more
- Combination of Protons &
- distance from nucleus to valence shell
What is the most Important bond in living systems?
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