BIOL 150 exam 1 QUESTION AND
ANSWERS RATED A+ (32 PGS)
In scientific inquiry, hypotheses lead most directly to:
a. predictions.
b. conclusions
c. theories.
d. observations.
e. experiments. - correct answer ✔a. predictions
true or false: Theories typically rely on a single hypothesis tested several
times; theories do not take into consideration multiple hypotheses. - correct
answer ✔false
true or false: Living systems use energy from the sun or from chemical
compounds to do work. Some of this energy is lost as heat, reducing the total
amount of energy in the universe. - correct answer ✔false
The designation of a magnesium ion as Mg2+ indicates an atom that has:
a. two more protons than neutrons.
b. gained two protons and is negatively charged.
c. lost two electrons and is positively charged.
d. gained two protons and is positively charged.
e. lost two electrons and is negatively charged. - correct answer ✔c. lost two
electrons and is positively charged
,An atom with three electrons has:
a. two occupied orbitals, one of which has two electrons and the other has
one.
b. three energy shells, each of which contains one electron.
c. one occupied orbital with three electrons.
d. three occupied orbitals, each of which contains one electron. - correct
answer ✔a. two occupied orbitals, one of which has two electrons and the
other has one.
Which one of the properties of water is primarily responsible for the ability of
trees to draw water up from the roots to the leaves?
a. pH neutrality
b. density
c. solvent capability
d. polarity
e. cohesion - correct answer ✔e. cohesion
A researcher has measured the pH of a solution and found that the pH is 10.
This solution is _____ and has more _____ compared to _____.
a. acidic; hydroxide ions; protons
b. neutral; hydroxide ions; protons
c. basic; hydroxide ions; protons
d. acidic; protons; hydroxide ions
,e. basic; protons; hydroxide ions - correct answer ✔c. basic; hydroxide ions;
protons
A 1,4-glycosidic linkage would refer to which example?
a. hydrogen bonding between carbon 1 and carbon 4 within a
monosaccharide
b. the covalent bond between carbon 1 of one monosaccharide and carbon 4
of a second monosaccharide
c. the covalent bond between the 1' carbon of one nucleotide and the 4'
carbon of a second nucleotide
d. the covalent bond between amino acid 1 in one protein and amino acid 4 in
a second protein
e. hydrogen bonding among the four bases in double-stranded DNA - correct
answer ✔b. the covalent bond between carbon 1 of one monosaccharide and
carbon 4 of a second monosaccharide
What causes fats to solidify at cooler temperatures?
a. crystallization.
b. the hydrophobic effect.
c. hydrogen bonds.
d. van der Waals forces. - correct answer ✔d. van der Waals forces.
Which biomolecule is defined by a physical property instead of a chemical
structure?
a. polysaccharides
b. proteins
, c. lipids
d. monosaccharides
e. nucleic acids - correct answer ✔c. lipids
in some experiments, several identical groups are set up, keeping conditions
similar among them. In the ______ group, a change is deliberately introduced.
In the _____ group, this change is not introduced. In this way, the researcher
can determine if the change has an effect.
a. variable; null
b. null; variable
c. control; test
d. test; control - correct answer ✔d. test; control
in pasteur's experiment, showing that living microorganisms arise from other
living microorganisms, which of the following statements most accurately
describes pasteur's hypothesis?
a. straight-neck flasks should allow for more contamination that swan-neck
flasks
b. sterilization of broth kills microbes
c. if microbes arise from nonliving matter, they should appear spontaneously
in both sterile and non-sterile broth
d. microbes should be capable of growing equally well in sterile broth
contained in both straight-neck and swan- neck flasks - correct answer ✔c. if
microbes arise from nonliving matter, they should appear spontaneously in
both sterile and non-sterile broth
it was only by sterilizing the culture medium and preventing microbe access to
it that pasteur was able to disprove the idea of spontaneous generation of life.
ANSWERS RATED A+ (32 PGS)
In scientific inquiry, hypotheses lead most directly to:
a. predictions.
b. conclusions
c. theories.
d. observations.
e. experiments. - correct answer ✔a. predictions
true or false: Theories typically rely on a single hypothesis tested several
times; theories do not take into consideration multiple hypotheses. - correct
answer ✔false
true or false: Living systems use energy from the sun or from chemical
compounds to do work. Some of this energy is lost as heat, reducing the total
amount of energy in the universe. - correct answer ✔false
The designation of a magnesium ion as Mg2+ indicates an atom that has:
a. two more protons than neutrons.
b. gained two protons and is negatively charged.
c. lost two electrons and is positively charged.
d. gained two protons and is positively charged.
e. lost two electrons and is negatively charged. - correct answer ✔c. lost two
electrons and is positively charged
,An atom with three electrons has:
a. two occupied orbitals, one of which has two electrons and the other has
one.
b. three energy shells, each of which contains one electron.
c. one occupied orbital with three electrons.
d. three occupied orbitals, each of which contains one electron. - correct
answer ✔a. two occupied orbitals, one of which has two electrons and the
other has one.
Which one of the properties of water is primarily responsible for the ability of
trees to draw water up from the roots to the leaves?
a. pH neutrality
b. density
c. solvent capability
d. polarity
e. cohesion - correct answer ✔e. cohesion
A researcher has measured the pH of a solution and found that the pH is 10.
This solution is _____ and has more _____ compared to _____.
a. acidic; hydroxide ions; protons
b. neutral; hydroxide ions; protons
c. basic; hydroxide ions; protons
d. acidic; protons; hydroxide ions
,e. basic; protons; hydroxide ions - correct answer ✔c. basic; hydroxide ions;
protons
A 1,4-glycosidic linkage would refer to which example?
a. hydrogen bonding between carbon 1 and carbon 4 within a
monosaccharide
b. the covalent bond between carbon 1 of one monosaccharide and carbon 4
of a second monosaccharide
c. the covalent bond between the 1' carbon of one nucleotide and the 4'
carbon of a second nucleotide
d. the covalent bond between amino acid 1 in one protein and amino acid 4 in
a second protein
e. hydrogen bonding among the four bases in double-stranded DNA - correct
answer ✔b. the covalent bond between carbon 1 of one monosaccharide and
carbon 4 of a second monosaccharide
What causes fats to solidify at cooler temperatures?
a. crystallization.
b. the hydrophobic effect.
c. hydrogen bonds.
d. van der Waals forces. - correct answer ✔d. van der Waals forces.
Which biomolecule is defined by a physical property instead of a chemical
structure?
a. polysaccharides
b. proteins
, c. lipids
d. monosaccharides
e. nucleic acids - correct answer ✔c. lipids
in some experiments, several identical groups are set up, keeping conditions
similar among them. In the ______ group, a change is deliberately introduced.
In the _____ group, this change is not introduced. In this way, the researcher
can determine if the change has an effect.
a. variable; null
b. null; variable
c. control; test
d. test; control - correct answer ✔d. test; control
in pasteur's experiment, showing that living microorganisms arise from other
living microorganisms, which of the following statements most accurately
describes pasteur's hypothesis?
a. straight-neck flasks should allow for more contamination that swan-neck
flasks
b. sterilization of broth kills microbes
c. if microbes arise from nonliving matter, they should appear spontaneously
in both sterile and non-sterile broth
d. microbes should be capable of growing equally well in sterile broth
contained in both straight-neck and swan- neck flasks - correct answer ✔c. if
microbes arise from nonliving matter, they should appear spontaneously in
both sterile and non-sterile broth
it was only by sterilizing the culture medium and preventing microbe access to
it that pasteur was able to disprove the idea of spontaneous generation of life.
