BIO 311C Final Hansen Comprehensive assessment test
questions with 134- correct answers /2025//2026.GRADE A+
What is the biological hierarchy? Levels and examples. - ANSWER: 1. Atoms = C,H,O
2. Molecule = amino acid, sugars
3. Macromolecules = proteins, lipids
4. Parts of cells = membrane, nuclei
5. Cell = bacteria, yeast, skin cell
6. Tissue = epithelial tissue, bone
7. Organ = brain, heart
8. Organ System = immune system
9. Organism = human
10. Population = all individuals of a single species
11.. Ecosystem = collection of populations
12. Biomes = desert, forest
13. Biosphere = Living crust of the earth
Covalent Bonds (polar and non polar) - ANSWER: two atoms which share a pair of
electrons
polar = two atoms share electrons unequally (example: H2O)
non polar = two atoms which share electrons equally (example: H2)
Ionic Bonds - ANSWER: bonding due to attraction of positive and negative charges
(weaker than covalent bonds) (example: NaCl)
H-Bonding - ANSWER: electrostatic attraction between polar molecules that occurs when
a hydrogen (H) atom bound to a highly electronegative atom such as nitrogen (N), oxygen
(O) or fluorine (F) experiences attraction to some other nearby highly electronegative atom
(example: NH3)
Van der Waals Interactions - ANSWER: weakest bond with temporary changes (example:
lipids)
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,Hydrophilic Interactions - ANSWER: (water loving) substances are normally polar,
charged molecules, soluble in water
Hydrophobic Interactions - ANSWER: (water fearing) normally non polar, lipid-soluble
molecules that are excluded from aqueous solutions by hydrogen bonding among polar
molecules
Which part of the atom mainly determines how the atom behaves chemically?
A. proton
B. electron
C. neutron
D. meson
E. gluon - ANSWER: B
Which of the following is the correct ranking of the three bonds and interactions in order
from highest to lowest in terms of their bond strength between two side chains of a protein in
their tertiary structure?
I. Disulfide bond between two cystines
II. Hydrophobic interactions between two leucines
III. H-bonding in water - ANSWER: I, III, II
Which of the following molecules is most polar?
A. CO2
B. CH4
C. CH3OH
D. C2H6
E. O2 - ANSWER: C
When water freezes to form ice, the ___ connect the water molecules.
A. covalent bonds
B. ionic bonds
C. H-bonds
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, D. van der waals forces
E. hydrophobic interactions - ANSWER: C
When Magnesium and chlorines with two electrons and seven electrons respectively in their
valence shells interact, they will form ___.
A. covalent bonds
B. ionic bonds
C. H-bonds
D. van der waals forces
E. hydrophobic interactions - ANSWER: B
Which bonds will break when water evaporates?
A. covalent bonds
B. ionic bonds
C. H-bonds
D. van der waals forces
E. hydrophobic interactions - ANSWER: C
Which of the following properties of water is the most essential to support life?
A. Ability to maintain pH
B. H-bonding property
C. High specific temperature
D. Good solvent for both polar and non-polar substances E. Medium and a reactant for
biochemical reactions - ANSWER: E
A solution contains 0.001 moles of hydroxide ions [OH-] per liter. Which of the following
best describes this solution?
A. Slightly acidic
B. Slightly basic
C. Strongly acidic
D. Strongly basic
E. Neutral in pH - ANSWER: D
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questions with 134- correct answers /2025//2026.GRADE A+
What is the biological hierarchy? Levels and examples. - ANSWER: 1. Atoms = C,H,O
2. Molecule = amino acid, sugars
3. Macromolecules = proteins, lipids
4. Parts of cells = membrane, nuclei
5. Cell = bacteria, yeast, skin cell
6. Tissue = epithelial tissue, bone
7. Organ = brain, heart
8. Organ System = immune system
9. Organism = human
10. Population = all individuals of a single species
11.. Ecosystem = collection of populations
12. Biomes = desert, forest
13. Biosphere = Living crust of the earth
Covalent Bonds (polar and non polar) - ANSWER: two atoms which share a pair of
electrons
polar = two atoms share electrons unequally (example: H2O)
non polar = two atoms which share electrons equally (example: H2)
Ionic Bonds - ANSWER: bonding due to attraction of positive and negative charges
(weaker than covalent bonds) (example: NaCl)
H-Bonding - ANSWER: electrostatic attraction between polar molecules that occurs when
a hydrogen (H) atom bound to a highly electronegative atom such as nitrogen (N), oxygen
(O) or fluorine (F) experiences attraction to some other nearby highly electronegative atom
(example: NH3)
Van der Waals Interactions - ANSWER: weakest bond with temporary changes (example:
lipids)
1|Page
,Hydrophilic Interactions - ANSWER: (water loving) substances are normally polar,
charged molecules, soluble in water
Hydrophobic Interactions - ANSWER: (water fearing) normally non polar, lipid-soluble
molecules that are excluded from aqueous solutions by hydrogen bonding among polar
molecules
Which part of the atom mainly determines how the atom behaves chemically?
A. proton
B. electron
C. neutron
D. meson
E. gluon - ANSWER: B
Which of the following is the correct ranking of the three bonds and interactions in order
from highest to lowest in terms of their bond strength between two side chains of a protein in
their tertiary structure?
I. Disulfide bond between two cystines
II. Hydrophobic interactions between two leucines
III. H-bonding in water - ANSWER: I, III, II
Which of the following molecules is most polar?
A. CO2
B. CH4
C. CH3OH
D. C2H6
E. O2 - ANSWER: C
When water freezes to form ice, the ___ connect the water molecules.
A. covalent bonds
B. ionic bonds
C. H-bonds
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, D. van der waals forces
E. hydrophobic interactions - ANSWER: C
When Magnesium and chlorines with two electrons and seven electrons respectively in their
valence shells interact, they will form ___.
A. covalent bonds
B. ionic bonds
C. H-bonds
D. van der waals forces
E. hydrophobic interactions - ANSWER: B
Which bonds will break when water evaporates?
A. covalent bonds
B. ionic bonds
C. H-bonds
D. van der waals forces
E. hydrophobic interactions - ANSWER: C
Which of the following properties of water is the most essential to support life?
A. Ability to maintain pH
B. H-bonding property
C. High specific temperature
D. Good solvent for both polar and non-polar substances E. Medium and a reactant for
biochemical reactions - ANSWER: E
A solution contains 0.001 moles of hydroxide ions [OH-] per liter. Which of the following
best describes this solution?
A. Slightly acidic
B. Slightly basic
C. Strongly acidic
D. Strongly basic
E. Neutral in pH - ANSWER: D
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