Bio 111 midterm UPDATED Questions and
CORRECT Answers
In some experiments, variables may exist that are unknown to a researcher. In which type of
experiment is this likely to be the case? - CORRECT ANSWER - comparative experiment
In the controlled experiment performed by Tyrone Hayes and his colleagues, which of the
following was the independent variable? - CORRECT ANSWER - the amount of atrazine
in the waters
In the experiments performed by Tyrone Hayes and his colleagues, the concentration of atrazine
in the water correlated with the percentage of affected frogs. - CORRECT ANSWER -
false
In which type of bond has an electron been donated from one atom to another? - CORRECT
ANSWER - ionic
When an atom loses an electron, it is called - CORRECT ANSWER - cation
If the electronegativity of an atom is relatively high, when this atom forms bonds with other
atoms with lower electronegativities, what does it tend to do? - CORRECT ANSWER - It
pulls electrons closer to itself, away from the other atom
The part of the atom that determines how the atom behaves chemically is the - CORRECT
ANSWER - electron
Which of the elements listed below does not follow the octet rule? - CORRECT
ANSWER - hydrogen
Given the electron shell configuration and mass and atomic numbers for the sodium ion (Na+)
shown here, select the correct choice to complete the following sentence: The sodium ion has
,_______ protons in its nucleus, has _______ electrons in its outermost shell, and is a(n)
_______. - CORRECT ANSWER - 11; 8; cation
All of the following are nonpolar except for - CORRECT ANSWER - A. O2.
B. N2.
C. CH4.
---------D. NaCl.
E. H2.
Of the different types of chemical bonds, the strongest bond in biological systems is the _______
bond. - CORRECT ANSWER - covalent
Two carbon atoms held together in a double covalent bond share _______ electron(s). -
CORRECT ANSWER - four
Cholesterol is composed primarily of carbon and hydrogen atoms. Therefore, one would expect
cholesterol to be - CORRECT ANSWER - insoluble in water
Which of the following molecular structures is incorrect? - CORRECT ANSWER - --------
------A. CH3—NH3
B. CH2==CH2
C. CH3—NH2
D. CH3—NH3+
E. CH3—CH3
Aldehydes and ketones are very similar in that they both contain - CORRECT ANSWER -
a C=O group
What is starch? - CORRECT ANSWER - A polysaccharide formed by a series of
condensation reactions
, Which of the following is true of monosaccharides? - CORRECT ANSWER -
Monosaccharides are the monomers of polysaccharides.
The general chemical formula for carbohydrates includes the atoms - CORRECT
ANSWER - C, H, and O.
Starch and glycogen, which are both polysaccharides, differ structurally in that glycogen
_______, whereas starch _______. - CORRECT ANSWER - is highly branched; is
moderately branched
The bonds that link sugar monomers in a starch molecule are _______ linkages. - CORRECT
ANSWER - glycosidic
Which of the following is the difference between nucleosides and nucleotides? - CORRECT
ANSWER - Only nucleotides contain a phosphate group
Ribose and deoxyribose are both found in nucleic acids. The difference between ribose and
deoxyribose is that - CORRECT ANSWER - deoxyribose has one less oxygen molecule
than ribose has & deoxyribose is found in DNA, whereas ribose is found in RNA
DNA carries genetic information in its - CORRECT ANSWER - sequence of bases
What accounts for the stability of the double-stranded DNA molecule? - CORRECT
ANSWER - The hydrogen bonds between purines and pyrimidines
Amino acids can be classified by the - CORRECT ANSWER - characteristics of their side
chains
All proteins - CORRECT ANSWER - consist of one or more polypeptide chains
CORRECT Answers
In some experiments, variables may exist that are unknown to a researcher. In which type of
experiment is this likely to be the case? - CORRECT ANSWER - comparative experiment
In the controlled experiment performed by Tyrone Hayes and his colleagues, which of the
following was the independent variable? - CORRECT ANSWER - the amount of atrazine
in the waters
In the experiments performed by Tyrone Hayes and his colleagues, the concentration of atrazine
in the water correlated with the percentage of affected frogs. - CORRECT ANSWER -
false
In which type of bond has an electron been donated from one atom to another? - CORRECT
ANSWER - ionic
When an atom loses an electron, it is called - CORRECT ANSWER - cation
If the electronegativity of an atom is relatively high, when this atom forms bonds with other
atoms with lower electronegativities, what does it tend to do? - CORRECT ANSWER - It
pulls electrons closer to itself, away from the other atom
The part of the atom that determines how the atom behaves chemically is the - CORRECT
ANSWER - electron
Which of the elements listed below does not follow the octet rule? - CORRECT
ANSWER - hydrogen
Given the electron shell configuration and mass and atomic numbers for the sodium ion (Na+)
shown here, select the correct choice to complete the following sentence: The sodium ion has
,_______ protons in its nucleus, has _______ electrons in its outermost shell, and is a(n)
_______. - CORRECT ANSWER - 11; 8; cation
All of the following are nonpolar except for - CORRECT ANSWER - A. O2.
B. N2.
C. CH4.
---------D. NaCl.
E. H2.
Of the different types of chemical bonds, the strongest bond in biological systems is the _______
bond. - CORRECT ANSWER - covalent
Two carbon atoms held together in a double covalent bond share _______ electron(s). -
CORRECT ANSWER - four
Cholesterol is composed primarily of carbon and hydrogen atoms. Therefore, one would expect
cholesterol to be - CORRECT ANSWER - insoluble in water
Which of the following molecular structures is incorrect? - CORRECT ANSWER - --------
------A. CH3—NH3
B. CH2==CH2
C. CH3—NH2
D. CH3—NH3+
E. CH3—CH3
Aldehydes and ketones are very similar in that they both contain - CORRECT ANSWER -
a C=O group
What is starch? - CORRECT ANSWER - A polysaccharide formed by a series of
condensation reactions
, Which of the following is true of monosaccharides? - CORRECT ANSWER -
Monosaccharides are the monomers of polysaccharides.
The general chemical formula for carbohydrates includes the atoms - CORRECT
ANSWER - C, H, and O.
Starch and glycogen, which are both polysaccharides, differ structurally in that glycogen
_______, whereas starch _______. - CORRECT ANSWER - is highly branched; is
moderately branched
The bonds that link sugar monomers in a starch molecule are _______ linkages. - CORRECT
ANSWER - glycosidic
Which of the following is the difference between nucleosides and nucleotides? - CORRECT
ANSWER - Only nucleotides contain a phosphate group
Ribose and deoxyribose are both found in nucleic acids. The difference between ribose and
deoxyribose is that - CORRECT ANSWER - deoxyribose has one less oxygen molecule
than ribose has & deoxyribose is found in DNA, whereas ribose is found in RNA
DNA carries genetic information in its - CORRECT ANSWER - sequence of bases
What accounts for the stability of the double-stranded DNA molecule? - CORRECT
ANSWER - The hydrogen bonds between purines and pyrimidines
Amino acids can be classified by the - CORRECT ANSWER - characteristics of their side
chains
All proteins - CORRECT ANSWER - consist of one or more polypeptide chains
