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Cambridge AS & A Level Biology 9700 — Revision Notes

1 · Cell Structure

0/26

2 · Biological Molecules

0/51

3 · Enzymes

0/29

4 · Cell Membranes and Transport

0/41

5 · The Mitotic Cell Cycle

0/21

6 · Nucleic Acids and Protein Synthesis

0/22

7 · Transport in Plants

0/28

8 · Transport in Mammals

0/39

9 · Gas Exchange

0/13

10-11 · Infectious Disease and Immunity

0/43

12 · Energy and Respiration

0/37

13 · Photosynthesis

0/23

14-15 · Homeostasis and Control

0/57

16 · Inherited Change

0/33

17-18 · Selection, Evolution, Classification and Conservation

0/70

19 · Genetic Technology

0/44
Quiz

2.3 Proteins – Check yourself

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Proteins Biology 9700 check yourself quiz: free practice for Cambridge AS & A Level Biology 9700. Work through this Proteins Biology 9700 check yourself quiz and get instant feedback on every answer. If you get stuck, review the 2.3 Proteins — 9700 Notes lesson. More practice: Cambridge AS & A Level Biology 9700 — all units. Syllabus: Cambridge AS & A Level Biology 9700 syllabus.

  • Questions count: 10
  • Passing grade: B
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1.

Amino acids are joined by

glycosidic bonds
peptide bonds
ester bonds
phosphodiester bonds
2.

The primary structure of a protein is

the sequence of amino acids in the polypeptide chain
the α-helix
the overall 3D shape
the number of polypeptides
3.

Secondary structure is held together by

disulfide bonds
hydrogen bonds between C=O and N–H groups of the backbone
ionic bonds between R groups
peptide bonds only
4.

Which bond in tertiary structure is the strongest?

Hydrogen bond
Hydrophobic interaction
Ionic bond
Disulfide bond
5.

Haemoglobin is

a fibrous protein
a single polypeptide
a globular protein with quaternary structure and four haem groups
a lipid
6.

Collagen is

a globular protein
soluble in water
a fibrous protein of three polypeptides wound into a triple helix
an enzyme
7.

Globular proteins are usually soluble because

they are very small
they are fibrous
they have no R groups
hydrophilic R groups are on the outside of the molecule
8.

The biuret test gives a positive result for protein of

brick red
blue-black
cloudy white
purple (lilac)
9.

Collagen’s great tensile strength is due to

α-helices only
its solubility
its haem groups
covalent cross-links between molecules in staggered fibrils
10.

Denaturation of a protein involves

breaking of peptide bonds
loss of its tertiary structure as bonds between R groups break
a change in primary structure
addition of amino acids
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Part of 2 · Biological Molecules — see every lesson and quiz in this unit.
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