The table gives a comparison of the light microscope and the electron microscope.
Which comparison is not true?
| light microscope | electron microscope | |
|---|---|---|
| A | view natural colours | all images are in black and white |
| B | uses glass lenses for focusing | uses magnetic lenses for focusing |
| C | specimen must be killed and stained | specimen may be alive and non-stained |
| D | magnification is low | magnification is high |
A secretory cell was supplied with radioactively labelled amino acids.
In which organelle will radioactivity be detected last?
The diagrams show a plant cell.
Which part, A, B, C or D, is responsible for the production of proteins?
The diagram shows a plant cell drawn to scale.
What is the magnification of the cell?
Benedict's test was performed on a 20 cm³ sample of four fruit syrups. A second 20 cm³ sample of each was then hydrolysed and tested with Benedict's solution. The table shows the masses of precipitate formed.
Which syrup contains the highest amount of non-reducing sugar?
| mass of precipitate before hydrolysis /mg | total mass of precipitate after hydrolysis / mg | |
|---|---|---|
| A | 25 | 45 |
| B | 50 | 82 |
| C | 55 | 57 |
| D | 75 | 85 |
The flow chart shows a metabolic pathway.
S →(e1) P₁ →(e2) P₂ →(e3) P₃ →(e4) P₄
During end product inhibition, P₄ inhibits
DNA was cultured in a medium containing the heavy Nitrogen isotope ¹⁵N for many generations until nearly all of the DNA contained ¹⁵N. The DNA was then allowed to replicate twice in ¹⁴N.
Which of the tubes A, B, C or D, shows the bands of DNA after the two replications?
The events that occur during nuclear division are listed below.
1. centromeres divide
2. whole chromosomes separate
3. pairs of chromosomes line up on the equator
Which of the events occur during meiosis only?
A DNA sample contains the following relative amounts of nitrogenous bases.
Purines: adenine 29.1%, base 1 21.8%
Pyrimidines: base 2 23.1%, base 3 27.6%
Identify base 2
The diagram shows a RNA molecule
What name is given to sequence A?
In shorthorn cattle, there is a gene that determines coat colour. The gene has two alleles:
Cᵂ produces a white coat when homozygous.
Cᴿ produces a red coat when homozygous.
In the heterozygous state the coat is light red, a colour also known as roan. The roan coat is a mixture of white hairs and red hairs.
The Cᵂ and Cᴿ alleles are codominant.
In a cross between a roan male and a roan female, what is the percentage of offspring with a roan coat?
The diagram represents the structure of a chloroplast.
What happens at P, Q and R?
| P | Q | R | |
|---|---|---|---|
| A | carbohydrate storage | carbohydrate synthesis | light absorption |
| B | carbohydrate synthesis | carbohydrate storage | light absorption |
| C | light absorption | carbohydrate storage | carbohydrate synthesis |
| D | light absorption | carbohydrate synthesis | carbohydrate storage |
The statements below describe some biochemical reactions.
1. ATP donates a phosphate group to glucose.
2. Triose phosphate is oxidised to lactate.
3. A six carbon sugar bisphosphate splits into two sugar phosphates.
Which of the reactions form part of glycolysis?
The graph shows the relation between a leaf feature and the rate of water uptake in roots.
What is the leaf feature?
The diagram is an illustration of Munch's mass flow hypothesis.
Which labelled part, A, B, C or D represents the sink?
How are tracheids and companion cells adapted to their functions?
| tracheids | companion cell | |
|---|---|---|
| A | no cytoplasm, allows mass flow | pits, allows lateral movement of water |
| B | nuclei, control cell energy | no cytoplasm, allows mass flow |
| C | numerous mitochondria, supply energy | nuclei, control cell division |
| D | pits, allow lateral movement of water | numerous mitochondria, supply energy |
The diagram represents the change in electrical potential across the heart during one cardiac cycle.
What is the pulse rate?
The graph shows the changes in permeability of the cell surface membrane of an axon to ions during an action potential.
Which ions are represented by the curves X and Y?
curve X, curve Y
A: K⁺ ions, Ca²⁺ ions
B: K⁺ ions, Na⁺ ions
C: Na⁺ ions, K⁺ ions
D: Na⁺ ions, Ca²⁺ ions
The diagram shows a transverse section of a myelinated nerve fibre.
Which row shows the correct names of the parts labelled M and N?
M, N
A: axon, nucleus
B: Schwann cell, nucleus
C: Schwann cell, axon
D: axon, Schwann cell
Clomiphene is a fertility drug that increases gonadotrophic production.
Which one is a target for this drug?
The diagram represents gametogenesis
Which name is given to cell P?
The diagram represents a germinated pollen grain
Which part is responsible for the formation of the pollen tube?
Sit the paper here to see which ones you got right. Danho explains every question, keeps your score, and works without a connection.