AS Level Biology A H020/02 Depth In Biology Monday
AS Level Biology A H020/02 Depth in biology Monday
Exam (elaborations)
AS Level Biology A H020/02 Depth in biology Monday 4 June 2018 - Afternoon EXAM QUESTIONS AND AMSWERS 100% CORRECT!
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AS Level Biology A H020/02 Depth in biology Monday
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AS Level Biology A H020/02 Depth In Biology Monday
Pepsin is a protease enzyme with a polypeptide chain containing 327 amino acids.
Titin is the largest known protein. It has a polypeptide chain containing at least 92 times more amino acids than pepsin.
(i) DNA sequences in genes code for polypeptide molecules such as pepsin and titin.
Explai...
, AS Level Biology A H020/02 Depth in
biology Monday 4 June 2018 - Afternoon
EXAM QUESTIONS AND AMSWERS 100%
CORRECT!
(a) Fig. 1.1 shows the general structure of an amino acid
State the names of the groups labelled U and V - ANSWER U- amine group
V- carboxyl group
Fig. 1.2 shows a representation of a short polypeptide chain made from three amino
acids
Name bond W and state what type of reaction takes place to form this bond. - ANSWER
Name of bond W- peptide bond
Type of reaction- condensation reaction
Pepsin is a protease enzyme with a polypeptide chain containing 327 amino acids.
Titin is the largest known protein. It has a polypeptide chain containing 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 known as transcription is necessary for polypeptide synthesis -
ANSWER DNA, copied to mRNA
DNA, is too large to leave nucleus
Calculate the minimum length of the DNA base sequence required to code for titin.
Show your working - ANSWER 327 x 92 x 3= 90,252
* Titin is a fibrous protein. Pepsin is a globular protein. Compare the properties and
functions of fibrous proteins and globular proteins in the human body - ANSWER
Properties:
Globular-soluble, Fibrous- insoluble
Globular- tertiary structure, fibrous-no tertiary structure
Globular- Hydrophilic R groups on the outside
Fibrous- Hydrophobic R groups , strong flexible
Functions:
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