WorksheetsHuman Biology
Total questions: 11
Worksheet time: 10mins
Which of the following are components of DNA?
Deoxyribose, uracil and phosphate
Ribose, adenine and guanine
Deoxyribose, phosphate and adenine
Ribose, thymine and cytosine
Which of the following is the function of transfer RNA (tRNA)?
Transporting amino acids to a ribosome
Coding for the order of amino acids
Transcription of the DNA
Translation of the DNA
The base sequence for the same length of DNA before and after a gene
mutation was as follows:
Before mutation: ATT TCC GTT ATC CGG
After mutation:
ATT CCG TTA TCC GGA
Which type of mutation took place?
duplication
deletion
substitution
inversion
The statements below show some of the stages in the production of human
insulin from genetically modified bacteria.
1.DNA for insulin inserted into plasmids
2. Bacteria cloned
3. Plasmids inserted into bacteria
4. DNA for insulin cut out using restriction enzyme
Which of the following shows the correct sequence of steps in the process?
2-1-4-3
4 - 2-3-1
4-1- 3-2
2-3 4 1
Which of the following enzymes is used to join together pieces of DNA?
ligase
DNA polymerase
protease
restriction enzyme
Which of the following cell processes needs a source of metabolic energy?
diffusion
osmosis
respiration
active transport
How does denaturing by heat prevent an enzyme from working?
By providing kinetic energy to the substrate molecules
By preventing the substrate from binding with the active site
By preventing the products from leaving the active site
By increasing the optimum temperature for the enzyme
Enzymes increase the rate of a reaction. Consider the following statements
about the 'lock and key' model of enzyme action:
1 The reaction can only take place in the active site.
2 The active site is the 'key' to the substrate lock.
3 The enzyme is unable to take part in further reactions after the substrate has
left the active site.
4 When the substrate enters the active site, the energy needed to start the
reaction is reduced.
Which of the statements is/are true?
1 and 2
3 and 4
2 and 3
4 only
Which of the following is not an advantage of using an immobilised enzyme?
The enzyme can be collected with the products.
The enzyme is less affected by changes in pH
The enzyme is more stable at high temperatures.
The enzyme can be re-used.
A bag made of Visking tubing contains a 5% solution of sucrose. It is placed in
a beaker containing a 10% solution of sucrose. Which of the following will take place?
More water will enter the Visking tubing than leaves it and the volume of the
tubing will increase
More water will leave the Visking tubing than enters it and the volume of the
tubing will decrease
There will be no net movement of water and the volume will not change
At first the volume of the Visking tubing will increase, but it will then
decrease as pressure builds up in the bag
Which of the following is the best definition of 'differentiation'?
The organisation of the body into cells, tissues and organs
A type of cell division resulting in the growth of an embryo
The adaptation of a cell for its function
The process by which the structure of a cell becomes specialised for its
function
