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BIO 121 Exam 1 Review 2024
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BIO 121 Exam 1 Review 2024
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BIO 121 Exam 1 Review1. True or False: nothing in science is proven: True
2. Theory: well substained explanation of something in the natural
world that can incorporate facts, laws, hypothesises etc
3. Gravitational Theory: gravity is factual, there is a vast body of
knowledge that explains the facts of gravity
facts, inferences, laws, tested hypothesis
4. Evolutionary theory: facts. evolution itself is factual. inferences,
laws evolution accounts for the unity and diversity of life
5. emergent properties: new properties emerge at each level in
biological hierarchy result from arrangement of parts in an
ecosystem/community 6. number of protons determines:: what
chemical element it is
7. isotopes: same element, different number of neutrons 8.
valence shells: determine chemical properties lose, gain, or
share to fill valence shell
, 9. how many electrons are needed to fill a valence shell?: 8
except H and He (2)
10. silicon dioxide: sand, glass
11. atoms are joined by chemical bonds to form:: compounds
12. chemical formula: gives type and relative number of atoms in
sequence 13. covalent bonds: outer shells of atoms have joined.
strong and stable. atoms share valence electrons
14. Nonpolar: if electrons are shared equally
15. polar: if electrons are not shared equally (H2O) if one element is
more electronegative than the other
16. ionic bonds: form between positive (cations) and negative
(anions) strong w/o presence of water but weak in aqueous
solution (because water has + and - charges)
17. hydrogen bonds: relatively weak. form when hyd. atom w/ partial
positive is attracted to atom w/ partial negative
18. 4 main classes of biological molecules: proteins nucleic acids
carbohydrates
lipids
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