Beckers World of the cell 8th
edition chapter 3 exam Questions
With correct solutions already
Graded a+||updated
2025/2026||Brand neW Version
Disulfide bond - ANSWER ✓Forms between the sulfur atoms of two cysteine
amino acids residues. these become covalently linked following oxidation
reaction that removes 2 H from sulfhydryl groups. Covalent bond
Primary - ANSWER ✓Sequence of amino acids in a polypeptide/protein. The
order of amino acids appears from one end to the other. N to C terminus.
Important for genetic and structure.
secondary - ANSWER ✓Common. Describes local regions that results from
hydrogen bonds between NH and CO groups. forming alpha and beta sheets .
Tertiary structure - ANSWER ✓Final Folding. Comes about because of
properties of R groups . Neither respective or predictable., complex globular
shape, due to interactions between R-groups, such as hydrophobic interactions,
van der Waals interactions, hydrogen bonds, and disulfide bridges
Quaternary Structure - ANSWER ✓Two or more interact, Highest level of
organization occurring when protein contains more than one polypeptide chain.
Interactions creating a functional protein; coded by genes and amino acids;
three dimensional arrangement
, alpha helix - ANSWER ✓3.6 amino acids per turn. Repeating polymers.
peptide bonds form on the fourth amino acid. Every peptide is bonded CO
group by hydrogen bonds to peptide bond directly below it. NH directly above
it. Intramolecular.
Beta sheet - ANSWER ✓This structure is extented sheets with sucessive atoms
in peaks and troughs of pleats . The R groups of amino acids jut out on
alternating sheets . Intramolecular or intermolecular
Monosaccharide - ANSWER ✓The simplest carbohydrate, active alone or
serving as a monomer for disaccharides and polysaccharides. Also known as
simple sugars, the molecular formulas of monosaccharides are generally some
multiple of CH2O. Can be defined as a aldehyde or ketone that has two ore
more hydroxyl groups. There are two categories: aldosugars and ketosugars.
Most common is aldohexose D- glucose
Carbohydrate - ANSWER ✓Formula CnH2nOn
, a class of energy giving nutrients that invcludes sugars, starches, and fiber;
composed of one or more simple sugars bonded together
Diasaccharides - ANSWER ✓A sugar molecule consisting of two
monosaccharides linked by dehydration synthesis. Maltose, Lactose, Sucrose
and Fructose.
D glucose - ANSWER ✓Only one set of these isomers exists in nature, those
derived from the "right-handed form" of glucose, denoted D-glucose. D-glucose
is sometimes referred to as dextrose, although the use of this name is strongly
discouraged. The term dextrose is derived from dextrorotatory glucose.[2] This
name is therefore confusing when applied to the enantiomer, which rotates light
the opposite direction. Starch and cellulose are polymers derived from the
dehydration of D-glucose. The other stereoisomer, called L-glucose, is hardly
ever found in nature
edition chapter 3 exam Questions
With correct solutions already
Graded a+||updated
2025/2026||Brand neW Version
Disulfide bond - ANSWER ✓Forms between the sulfur atoms of two cysteine
amino acids residues. these become covalently linked following oxidation
reaction that removes 2 H from sulfhydryl groups. Covalent bond
Primary - ANSWER ✓Sequence of amino acids in a polypeptide/protein. The
order of amino acids appears from one end to the other. N to C terminus.
Important for genetic and structure.
secondary - ANSWER ✓Common. Describes local regions that results from
hydrogen bonds between NH and CO groups. forming alpha and beta sheets .
Tertiary structure - ANSWER ✓Final Folding. Comes about because of
properties of R groups . Neither respective or predictable., complex globular
shape, due to interactions between R-groups, such as hydrophobic interactions,
van der Waals interactions, hydrogen bonds, and disulfide bridges
Quaternary Structure - ANSWER ✓Two or more interact, Highest level of
organization occurring when protein contains more than one polypeptide chain.
Interactions creating a functional protein; coded by genes and amino acids;
three dimensional arrangement
, alpha helix - ANSWER ✓3.6 amino acids per turn. Repeating polymers.
peptide bonds form on the fourth amino acid. Every peptide is bonded CO
group by hydrogen bonds to peptide bond directly below it. NH directly above
it. Intramolecular.
Beta sheet - ANSWER ✓This structure is extented sheets with sucessive atoms
in peaks and troughs of pleats . The R groups of amino acids jut out on
alternating sheets . Intramolecular or intermolecular
Monosaccharide - ANSWER ✓The simplest carbohydrate, active alone or
serving as a monomer for disaccharides and polysaccharides. Also known as
simple sugars, the molecular formulas of monosaccharides are generally some
multiple of CH2O. Can be defined as a aldehyde or ketone that has two ore
more hydroxyl groups. There are two categories: aldosugars and ketosugars.
Most common is aldohexose D- glucose
Carbohydrate - ANSWER ✓Formula CnH2nOn
, a class of energy giving nutrients that invcludes sugars, starches, and fiber;
composed of one or more simple sugars bonded together
Diasaccharides - ANSWER ✓A sugar molecule consisting of two
monosaccharides linked by dehydration synthesis. Maltose, Lactose, Sucrose
and Fructose.
D glucose - ANSWER ✓Only one set of these isomers exists in nature, those
derived from the "right-handed form" of glucose, denoted D-glucose. D-glucose
is sometimes referred to as dextrose, although the use of this name is strongly
discouraged. The term dextrose is derived from dextrorotatory glucose.[2] This
name is therefore confusing when applied to the enantiomer, which rotates light
the opposite direction. Starch and cellulose are polymers derived from the
dehydration of D-glucose. The other stereoisomer, called L-glucose, is hardly
ever found in nature
