Danho
ZIMSEC A Level · J2020

Biology Paper 2 June 2020

Questions
15
Total marks
29

Sit this paper online

Questions
15
Pass mark
9
Sit this paper

Answer every question in the printed order, get marked at the end, then see the answers.

The questions

Question 101

[2 marks]proteins
Globular proteins differ from fibrous proteins in that globular proteins have
  1. Arepetitive amino acid sequences and long strands
  2. Bhydrophobic groups facing the surrounding water
  3. Chigh tensile strength and no tertiary structure
  4. Dirregular amino acid sequences and a compact shape

Question 102

[2 marks]proteins
Most globular proteins are soluble in water because they have
  1. Aa repetitive sequence of amino acid residues
  2. Bhydrophilic groups on the outside of the molecule
  3. Chydrophobic groups on the outside of the molecule
  4. Dno secondary structure within the polypeptide

Question 103

[2 marks]proteins
Which level of protein structure is most important in a fibrous protein such as collagen?
  1. Asecondary
  2. Btertiary
  3. Cprimary
  4. Dquaternary

Question 104

[2 marks]proteins
Keratin in hair and nails, and collagen in bone and cartilage, are examples of which class of protein, globular or fibrous?

Answer this when you sit the paper.

Question 201

[2 marks]properties of water
Water has a large latent heat of vaporisation, which is important to living organisms because
  1. Awater dissolves fats more readily than salts do
  2. Bwater molecules repel one another when heated
  3. Cevaporating a little water removes a lot of heat
  4. Dwater freezes at a temperature below that of ice

Question 202

[2 marks]properties of water
The high specific heat capacity of water is important to a cell because it
  1. Araises the rate of every enzyme reaction directly
  2. Ballows water to be split during respiration
  3. Cprevents any solute from dissolving in the cell
  4. Dkeeps the temperature of the cell contents stable

Question 203

[2 marks]properties of water
State the term for the attraction between water molecules that makes them stick to one another, allowing small insects to move across a water surface.

Answer this when you sit the paper.

Question 301

[1 marks]gene technology
State the term for the analysis of a person's DNA to check for abnormalities or genetic disease.

Answer this when you sit the paper.

Question 302

[2 marks]gene technology
Which pair of techniques is used in prenatal genetic screening?
  1. Agene therapy and somatic cell fusion
  2. Bpolymerase chain reaction and cloning
  3. Camniocentesis and chorionic villus sampling
  4. Dgel electrophoresis and paper chromatography

Question 303

[2 marks]gene technology
An advantage of genetic screening is that it
  1. Areduces the incidence of genetic disease
  2. Bcures every inherited disorder detected
  3. Cchanges the DNA sequence of the fetus
  4. Draises the number of genetic disorders

Question 304

[2 marks]gene technology
Genetic screening can benefit a country economically because it
  1. Alowers the cost of caring for genetic disease
  2. Braises the birth rate in the population
  3. Cincreases the demand for hospital beds
  4. Dshortens the training of medical doctors

Question 401

[2 marks]recombinant DNA technology
An advantage of treating haemophiliacs with genetically engineered factor VIII rather than factor VIII extracted from donated blood is that
  1. Athe treatment need be given only once in life
  2. Bthere is no risk of infection from a donor
  3. Cthe protein is absorbed when taken by mouth
  4. Dno clotting factor is needed by the patient

Question 402

[2 marks]recombinant DNA technology
Insulin must be injected rather than swallowed because it is
  1. Atoo large to pass out of the pancreas
  2. Bdestroyed by the low temperature of the gut
  3. Ca protein that would be digested in the gut
  4. Da lipid that cannot dissolve in the blood

Question 403

[2 marks]recombinant DNA technology
Which of the following is a non-biological method of introducing genes into host cells?
  1. Aplasmid transfer
  2. Bviral infection
  3. Cbacterial conjugation
  4. Delectroporation

Question 404

[2 marks]recombinant DNA technology
Mammalian cells are used as host cells to produce human factor VIII because they
  1. Aneed no growth medium in order to be cultured
  2. Bcarry out the correct post-translational modification
  3. Cdivide far more rapidly than bacterial cells are able to
  4. Dcontain no nucleus that could interfere with the gene

More sittings of this paper

The answers, and why they are the answers

Sit the paper here to see which ones you got right. Danho explains every question, keeps your score, and works without a connection.

Get it on Google PlayDownload on the App Store