AS Level Biology A H020/02 Depth in biology Monday 4 June 2018 - Afterno
Study online at https://quizlet.com/_bjj2b9
1. (a) Fig. 1.1 shows the U- amine group
general structure of an V- carboxyl group
amino acid
State the names of the
groups labelled U and V
2. Fig. 1.2 shows Name of bond W- peptide bond
a representation of Type of reaction- condensation reaction
a short polypeptide
chain made from three
amino acids
Name bond W and
state what type of reac-
tion takes place to form
this bond.
3. Pepsin is a protease en- DNA, copied to mRNA
zyme with a polypep- DNA, is too large to leave nucleus
tide chain containing
327 amino acids.
Titin is the largest
known protein. It has a
polypeptide chain con-
taining at least 92 times
more amino acids than
pepsin.
(i) DNA sequences
in genes code for
polypeptide molecules
such as pepsin and
titin.
Explain why a process
1/7
, AS Level Biology A H020/02 Depth in biology Monday 4 June 2018 - Afterno
Study online at https://quizlet.com/_bjj2b9
known as transcrip-
tion is necessary for
polypeptide synthesis
4. Calculate the minimum 327 x 92 x 3= 90,252
length of the DNA base
sequence required to
code for titin. Show
your working
5. * Titin is a fibrous Properties:
protein. Pepsin is a Globular-soluble, Fibrous- insoluble
globular protein. Com- Globular- tertiary structure, fibrous-no tertiary structure
pare the properties and Globular- Hydrophilic R groups on the outside
functions of fibrous Fibrous- Hydrophobic R groups , strong flexible
proteins and globular
proteins in the human Functions:
body Globular- to transport substances in blood • haemoglobin + role de-
scribed e.g. carry oxygen
to transport substances across cell membranes • carrier / channel / pump
+ role described
enzymes / metabolic role / to catalyse reaction(s) / to lower activation
energy • named enzyme + its specific role described
• hormones / receptors / for cell signaling • named hormone / insulin +
role described
Fibrous-
for protection • keratin in, skin / hair / nails
for structure • collagen in, bone
2/7
Study online at https://quizlet.com/_bjj2b9
1. (a) Fig. 1.1 shows the U- amine group
general structure of an V- carboxyl group
amino acid
State the names of the
groups labelled U and V
2. Fig. 1.2 shows Name of bond W- peptide bond
a representation of Type of reaction- condensation reaction
a short polypeptide
chain made from three
amino acids
Name bond W and
state what type of reac-
tion takes place to form
this bond.
3. Pepsin is a protease en- DNA, copied to mRNA
zyme with a polypep- DNA, is too large to leave nucleus
tide chain containing
327 amino acids.
Titin is the largest
known protein. It has a
polypeptide chain con-
taining at least 92 times
more amino acids than
pepsin.
(i) DNA sequences
in genes code for
polypeptide molecules
such as pepsin and
titin.
Explain why a process
1/7
, AS Level Biology A H020/02 Depth in biology Monday 4 June 2018 - Afterno
Study online at https://quizlet.com/_bjj2b9
known as transcrip-
tion is necessary for
polypeptide synthesis
4. Calculate the minimum 327 x 92 x 3= 90,252
length of the DNA base
sequence required to
code for titin. Show
your working
5. * Titin is a fibrous Properties:
protein. Pepsin is a Globular-soluble, Fibrous- insoluble
globular protein. Com- Globular- tertiary structure, fibrous-no tertiary structure
pare the properties and Globular- Hydrophilic R groups on the outside
functions of fibrous Fibrous- Hydrophobic R groups , strong flexible
proteins and globular
proteins in the human Functions:
body Globular- to transport substances in blood • haemoglobin + role de-
scribed e.g. carry oxygen
to transport substances across cell membranes • carrier / channel / pump
+ role described
enzymes / metabolic role / to catalyse reaction(s) / to lower activation
energy • named enzyme + its specific role described
• hormones / receptors / for cell signaling • named hormone / insulin +
role described
Fibrous-
for protection • keratin in, skin / hair / nails
for structure • collagen in, bone
2/7
