BSCI 1510 EXAM PREP QUESTIONS AND ANSWERS GRADED A+
1. 1. Water is critical for life on earth. Which one the following
statements is wrong?
A. water can dissolve the most substances
B. water can co-exist in three different states
C. water has positive and negative dipoles
D. water has two non-polarized O-H bonds
E. water molecules adhere to each other: D. water has two non-polarized
O-H bonds
2. 2. Which statement about atoms is wrong?
A. charges for an atom depend on the number of electrons in
outer shells
B. H can be either donated or accept electrons
C. all atoms are most stable with 8 electrons in the outermost shell
D. inert atoms do not lose electrons
E. Ionic bonds form between positive and negative charged groups:
C. all atoms are most stable with 8 electrons in the outermost shell
3. 3. To be most stable, an oxygen atom needs to acquire this
number of electrons:
A. -2
B. -1
C. 0
D. 1
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, E. 2: E. 2
4. 4. Which statement about chemical bonds is correct?
A. all chemical elements can form covalent bonds
B. breaking noncovalent bonds requires less energy than covalent
bonds
C. van der Waals forces must be formed between two nonpolar
molecules
D. noncovalent bonds depend on shared electrons
E. hydrogen bonds do not belong to the non-covalent bond group:
B. breaking noncovalent bonds requires less energy than covalent bonds
5. 5. What is true about the assumed energy cost of one
hydrophobic effect interaction?
A. equal to 1 H-bond strength
B. weaker in a vacuum
C. strongest at 4 angstroms
D. equal to ionic bond in vacuum
E. greater than ester bond: A. equal to 1 H-bond strength
6. 6. Which of the following groups is most reactive in the cytosol?
A. carboxyl
B. carbonyl
C. ketone
D. hydroxyl
E. aldehyde: A. carboxyl
7. 7. Despite science fiction speculation, why *NOT* have
silicon-based life forms? Si is not...
A. abundant enough
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1. 1. Water is critical for life on earth. Which one the following
statements is wrong?
A. water can dissolve the most substances
B. water can co-exist in three different states
C. water has positive and negative dipoles
D. water has two non-polarized O-H bonds
E. water molecules adhere to each other: D. water has two non-polarized
O-H bonds
2. 2. Which statement about atoms is wrong?
A. charges for an atom depend on the number of electrons in
outer shells
B. H can be either donated or accept electrons
C. all atoms are most stable with 8 electrons in the outermost shell
D. inert atoms do not lose electrons
E. Ionic bonds form between positive and negative charged groups:
C. all atoms are most stable with 8 electrons in the outermost shell
3. 3. To be most stable, an oxygen atom needs to acquire this
number of electrons:
A. -2
B. -1
C. 0
D. 1
1/
11
, E. 2: E. 2
4. 4. Which statement about chemical bonds is correct?
A. all chemical elements can form covalent bonds
B. breaking noncovalent bonds requires less energy than covalent
bonds
C. van der Waals forces must be formed between two nonpolar
molecules
D. noncovalent bonds depend on shared electrons
E. hydrogen bonds do not belong to the non-covalent bond group:
B. breaking noncovalent bonds requires less energy than covalent bonds
5. 5. What is true about the assumed energy cost of one
hydrophobic effect interaction?
A. equal to 1 H-bond strength
B. weaker in a vacuum
C. strongest at 4 angstroms
D. equal to ionic bond in vacuum
E. greater than ester bond: A. equal to 1 H-bond strength
6. 6. Which of the following groups is most reactive in the cytosol?
A. carboxyl
B. carbonyl
C. ketone
D. hydroxyl
E. aldehyde: A. carboxyl
7. 7. Despite science fiction speculation, why *NOT* have
silicon-based life forms? Si is not...
A. abundant enough
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11
