past paper Q bio MCQ Flashcards
A person touches a hot object and rapidly moves their hand away from the hot object.
Which characteristic of living organisms is this an example of?
A excretion
B growth
C reproduction
D sensitivity
D
Which types of organisms are used in genetic modification because they have plasmids?
A arachnids
B bacteria
C myriapods
D ferns
B
The list shows some of the structures contained in cells.
* cytoplasm
* cell membrane
* cell wall
* chloroplast
How many of these structures are found in the cells of all living organisms?
A 1 B 2 C 3 D 4
B
A student draws a red blood cell.
The diameter of the red blood cell they draw is 20mm.
The actual diameter of the red blood cell is 0.008mm.
What is the magnification of the student’s drawing?
A ×0.0004 B ×0.16 C ×250. Dx2500
Samples of plant cells from the same species are immersed in three different liquids. The low
concentration sucrose solution has a higher water potential than the plant cell cytoplasm. The high
concentration sucrose solution has a lower water potential than the plant cell cytoplasm.
What is the state of the cells in the different liquids?
distilled water low concentration high concentration
sucrose solution sucrose solution
A turgid plasmolysed flaccid
B. flaccid turgid plasmolysed
C flaccid plasmolysed flaccid
D turgid turgid plasmolysed
D
Which process requires energy from respiration?
A active transport
B diffusion
C osmosis
D transpiration
A
The diagram shows the sticky end of the DNA of a plasmid that has been cut by a restriction enzyme.
The unpaired bases are labelled.
. . . . C A G T G
What is the correct sequence of the missing bases?
A CAGTG B GTGAC C GTCAC D CACTG
C
A test was performed on a food substance. A positive result was shown by a colour change to
blue-black.
What solution was used for the test?
A biuret solution
B DCPIP solution
C iodine solution
D Benedict’s solution
C
A student investigates the breakdown of fats in milk by lipase. Four test-tubes labelled A, B, C and
D are set up.
The table shows the contents of each test-tube.
In which test-tube will the contents become acidic most quickly?
milk bile boiled lipase lipase A ✓ ✓ ✗ ✓ B ✓ ✓ ✓ ✓ C ✓ ✗ ✓ ✗ D ✗ ✓ ✓ ✓
A
https://docs.google.com/document/d/1UBBhDctttMwHkKiwVxonx5lhHX4XeTqrC4rfRDrXfI8/edit?tab=t.0
A
https://docs.google.com/document/d/1d_eiOO6e_mESqoBF7WLVskcb9m-A9L9tQsHfJTLutiM/edit?tab=t.0
B
https://docs.google.com/document/d/15tSaa49NAckY6YfaC1UPCeZrXddeJDMtGnpmOHqySuA/edit?tab=t.0
C
The list contains statements about villi.
1 Villi increase the efficiency of the absorption of nutrients.
2 Villi increase the efficiency of the alveoli during gas exchange.
3 Villi provide a large surface area.
4 Villi filter urea from the blood.
Which two statements explain the role of the villi in humans?
A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4
B
https://docs.google.com/document/d/1cF2McBMT57OxMAKE5Ws_FAyycDZtGvxI5ta67DyS4AM/edit?tab=t.0
B
https://docs.google.com/document/d/1XY8aLIjLr7fmdZuW6_dhMAWOaJVYN1qAff1KKs2f6pI/edit?tab=t.0
D
Which substance found in a healthy diet helps to prevent constipation?
A fat
B fibre
C minerals
D vitamins
B
When is the transpiration rate of a well-watered plant highest?
A on a cool, dry, windy day
B on a cool, wet, windy day
C on a hot, dry, windy day
D on a hot, wet, windy day
C
Which statement is correct for a flowering plant during photosynthesis?
A The flowers, fruits, leaves and roots are all sources of sucrose.
B The fruits are a source of sucrose and the flowers are a sink.
C The leaves are a source of sucrose and the fruits are a sink.
D The roots are a source of sucrose and the leaves are a sink.
C
What is an advantage of having a double circulatory system?
A It uses less energy because blood flows through the heart only once in each circuit around
the body.
B concentration gradients of solutes and gases are kept low.
C deoxygenated and oxygenated blood are separated to allow a high rate of oxygen supply
to the tissues.
D It maintains high-pressure blood flow to the lungs and low-pressure blood flow to the body.
C
https://docs.google.com/document/d/1W3GXT9wT9CWau129fwJxnpWYhIZmy3ywDtpaiwT9EKg/edit?tab=t.0
B
One of the symptoms of the disease cholera is diarrhoea. This is due to water loss by osmosis
caused by the cholera toxin.
What is the effect of cholera toxins that results in diarrhoea?
21
A secretion of chloride ions out of the small intestine lowering the water potential
B secretion of chloride ions out of the small intestine raising the water potential
C secretion of chloride ions into the small intestine lowering the water potential
D secretion of chloride ions into the small intestine raising the water potential
