test bank 2 exam questions with correct
answers
Essential amino acids that are used to build proteins
A) exist in twenty six different configurations.
B) are linked together by ionic chemical bonds in proteins.
C) can be used medically for both diagnosis and treatment of diseases.
D) are derived from the foods we eat and digest.
E) can only be made by cells within our bodies. - Answer-D) are derived from the
foods we eat and digest.
Which of the following are examples of cations?
A) SO42-
B) Ca2+
C) HPO42-
D) HCO3-
E) Cl- - Answer-B) Ca2+
A positively-charged ion is called a(n)
A) electron.
B) proton.
C) neutron.
D) cation.
E) anion. - Answer-D) cation.
The most important polar molecule is ________ because it is practically a universal
solvent.
A) water
B) bicarbonate
C) sodium chloride
D) magnesium sulfate
E) nucleic acid - Answer-A) water
A molecule referred to as highly soluble is
A) very likely to dissolve in water.
B) not very likely to dissolve in water.
C) called aqueous.
D) very likely to dissolve in water and is called aqueous.
E) not very likely to dissolve in water and is called aqueous. - Answer-A) very likely
to dissolve in water.
,A free radical is a
A) charged particle.
B) molecule with an extra electron.
C) molecule with an extra neutron.
D) molecule with an extra proton.
E) molecule with an unpaired electron. - Answer-E) molecule with an unpaired
electron.
The chemical bonding behavior of an atom is directly determined by the
A) number of protons.
B) number of neutrons.
C) number and arrangement of electrons.
D) size of the atom.
E) mass of the atom. - Answer-C) number and arrangement of electrons.
Atoms in a covalent molecule
A) share electrons in single pairs.
B) share electrons in double pairs.
C) share electrons in triple pairs.
D) share electrons singly, never in pairs.
E) can share electrons in single pairs, double pairs, or triple pairs. - Answer-E) can
share electrons in single pairs, double pairs, or triple pairs.
The weak interactions between atoms that keep atoms near each other are called
A) hydrogen bonds.
B) van der Waals forces.
C) ionic bonds.
D) hydrogen bonds and van der Waals forces.
E) van der Waals forces and ionic bonds. - Answer-D) hydrogen bonds and van der
Waals forces.
All of these statements about carbohydrates are true EXCEPT one. Identify the
exception.
A) Simple sugars include galactose, glucose, and ribose.
B) Cellulose is the most abundant polysaccharide on earth.
C) Glycogen is a storage polysaccharide made by animal cells.
D) Polysaccharides are important both for energy storage and to provide structure to
cells.
E) Glycogen is important both for energy storage and to provide structure for cells. -
Answer-E) Glycogen is important both for energy storage and to provide structure for
cells.
In regard to lipids, the term unsaturated refers to
A) the lack of double bonds between adjacent carbon atoms in a fatty acid.
, B) the presence of double bonds between adjacent carbon atoms in a fatty acid.
C) the ring structure of steroids.
D) glycerol, which acts as an anchor for joined fatty acids.
E) fats, such as butter and lard, which come from animal sources. - Answer-B) the
presence of double bonds between adjacent carbon atoms in a fatty acid.
Each amino acid differs from others in the
A) number of central carbon atoms.
B) size of the amino group.
C) number of carboxyl groups.
D) chemical structure of the R group.
E) number of peptide bonds in the molecule. - Answer-D) chemical structure of the R
group.
The alpha-helix and pleated sheet are examples of the ________ structure of a
protein.
A) primary
B) secondary
C) tertiary
D) quaternary
E) pentanary - Answer-B) secondary
Interactions between different globular or fibrous polypeptide chains result in which
type of structure?
A) primary
B) secondary
C) tertiary
D) quaternary
E) pentagonal - Answer-D) quaternary
The concentration of a solution expresses the amount of
A) solvent per volume of solute.
B) solute per volume of solvent.
C) solvent per volume of solution.
D) solute per volume of solution.
E) None of the answers are correct. - Answer-D) solute per volume of solution.
Nucleic acids are polymers of units called
A) amino acids.
B) fatty acids.
C) bases.
D) ribose.
E) nucleotides. - Answer-E) nucleotides.
A nucleotide consists of a
answers
Essential amino acids that are used to build proteins
A) exist in twenty six different configurations.
B) are linked together by ionic chemical bonds in proteins.
C) can be used medically for both diagnosis and treatment of diseases.
D) are derived from the foods we eat and digest.
E) can only be made by cells within our bodies. - Answer-D) are derived from the
foods we eat and digest.
Which of the following are examples of cations?
A) SO42-
B) Ca2+
C) HPO42-
D) HCO3-
E) Cl- - Answer-B) Ca2+
A positively-charged ion is called a(n)
A) electron.
B) proton.
C) neutron.
D) cation.
E) anion. - Answer-D) cation.
The most important polar molecule is ________ because it is practically a universal
solvent.
A) water
B) bicarbonate
C) sodium chloride
D) magnesium sulfate
E) nucleic acid - Answer-A) water
A molecule referred to as highly soluble is
A) very likely to dissolve in water.
B) not very likely to dissolve in water.
C) called aqueous.
D) very likely to dissolve in water and is called aqueous.
E) not very likely to dissolve in water and is called aqueous. - Answer-A) very likely
to dissolve in water.
,A free radical is a
A) charged particle.
B) molecule with an extra electron.
C) molecule with an extra neutron.
D) molecule with an extra proton.
E) molecule with an unpaired electron. - Answer-E) molecule with an unpaired
electron.
The chemical bonding behavior of an atom is directly determined by the
A) number of protons.
B) number of neutrons.
C) number and arrangement of electrons.
D) size of the atom.
E) mass of the atom. - Answer-C) number and arrangement of electrons.
Atoms in a covalent molecule
A) share electrons in single pairs.
B) share electrons in double pairs.
C) share electrons in triple pairs.
D) share electrons singly, never in pairs.
E) can share electrons in single pairs, double pairs, or triple pairs. - Answer-E) can
share electrons in single pairs, double pairs, or triple pairs.
The weak interactions between atoms that keep atoms near each other are called
A) hydrogen bonds.
B) van der Waals forces.
C) ionic bonds.
D) hydrogen bonds and van der Waals forces.
E) van der Waals forces and ionic bonds. - Answer-D) hydrogen bonds and van der
Waals forces.
All of these statements about carbohydrates are true EXCEPT one. Identify the
exception.
A) Simple sugars include galactose, glucose, and ribose.
B) Cellulose is the most abundant polysaccharide on earth.
C) Glycogen is a storage polysaccharide made by animal cells.
D) Polysaccharides are important both for energy storage and to provide structure to
cells.
E) Glycogen is important both for energy storage and to provide structure for cells. -
Answer-E) Glycogen is important both for energy storage and to provide structure for
cells.
In regard to lipids, the term unsaturated refers to
A) the lack of double bonds between adjacent carbon atoms in a fatty acid.
, B) the presence of double bonds between adjacent carbon atoms in a fatty acid.
C) the ring structure of steroids.
D) glycerol, which acts as an anchor for joined fatty acids.
E) fats, such as butter and lard, which come from animal sources. - Answer-B) the
presence of double bonds between adjacent carbon atoms in a fatty acid.
Each amino acid differs from others in the
A) number of central carbon atoms.
B) size of the amino group.
C) number of carboxyl groups.
D) chemical structure of the R group.
E) number of peptide bonds in the molecule. - Answer-D) chemical structure of the R
group.
The alpha-helix and pleated sheet are examples of the ________ structure of a
protein.
A) primary
B) secondary
C) tertiary
D) quaternary
E) pentanary - Answer-B) secondary
Interactions between different globular or fibrous polypeptide chains result in which
type of structure?
A) primary
B) secondary
C) tertiary
D) quaternary
E) pentagonal - Answer-D) quaternary
The concentration of a solution expresses the amount of
A) solvent per volume of solute.
B) solute per volume of solvent.
C) solvent per volume of solution.
D) solute per volume of solution.
E) None of the answers are correct. - Answer-D) solute per volume of solution.
Nucleic acids are polymers of units called
A) amino acids.
B) fatty acids.
C) bases.
D) ribose.
E) nucleotides. - Answer-E) nucleotides.
A nucleotide consists of a
