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