WorksheetsBiology A Level Revision quiz!
Total questions: 23
Worksheet time: 17mins
Which definition of the magnification of a drawing of a leaf is correct?
the actual size of an object multiplied by the magnification of the microscope
he difference in size between an actual object and a drawing of the object
the increase in size of an object when observed using a microscope
the size of the drawing of a specimen in comparison to the actual size
Which labelled features identify these cells as eukaryotic?
W, X and Y
W and X only
W only
X only
Plant cells are fixed, stained and viewed using a student microscope. The light source was natural light. What would be clearly visible at ×400 magnification?
cristae of mitochondria
grana of chloroplasts
nucleoli
ribosomes
Some secretory cells synthesise and release glycoproteins. What is the correct order of the sequence of events as they occur in the secretory cell?
1 exocytosis
2 product accumulates in secretory vesicle
3 mRNA binds to ribosomes
4 synthesis of glycoprotein
3, 4, 1, 2
3, 4, 2, 1
4, 3, 1, 2
4, 3, 2, 1
Which statement describes how the molecular structure of starch is suited to its function?
Amylose has a branched structure and amylopectin is coiled to give a compact molecule for transport.
In the breakdown of amylose and amylopectin, many condensation reactions release stored energy.
In the formation of amylose and amylopectin, many hydrolysis reactions allow the release of stored energy.
The amylose-amylopectin complex is insoluble and does not affect the water potential of the cell.
Cows and whales are mammals that produce milk to feed their babies. Newborn whales grow faster than newborn cows. The milk of both cows and whales contains saturated fatty acids with different chain lengths. The table shows the percentage of saturated fatty acids of different lengths in cow and whale milk.
Which statement about the ratio of short fatty acids (4–16 carbons) to long fatty acids (18 or more carbons) in the milk of cows and whales is correct?
The ratio in cow milk is higher because young cows need more energy than young whales.
The ratio in cow milk is lower because young cows need less energy than young whales.
The ratio in whale milk is higher because young whales need less energy than young cows
The ratio in whale milk is lower because young whales need more energy than young cows.
Bacterial cells divide by a process called binary fission. Which macromolecules must be synthesised for binary fission?
1 cell membrane proteins and RNA
2 DNA and peptidoglycan
3 enzymes and cellulose
1, 2 and 3
1 and 2 only
2 and 3 only
3 only
A student carried out experiments to investigate the effect of enzyme concentration on the rate of hydrolysis (break down) of protein in milk.
When the enzyme and milk were mixed, the protein was hydrolysed and the mixture changed from cloudy to clear. The student investigated five different enzyme concentrations and recorded the time taken to reach the end-point for each.
What is an appropriate control for this investigation?
Carrying out a further experiment where the enzyme solution is replaced with water.
Carrying out each experiment in a thermostatically regulated water-bath at 35 °C.
Performing three repeat experiments for each of the five enzyme concentrations.
Using the same volume of enzyme solution for each of the five experiments.
What determines the specificity of an enzyme?
1 the bonding between R groups of the polypeptide
2 the optimum pH of the enzyme
3 the peptide bonds between amino acids of the polypeptide
4 the shape of the substrate molecule
1, 2, 3 and 4
1 and 3 only
1 only
2, 3 and 4 only
The graph shows the effect of temperature on the rate at which the enzyme in a biological washing powder digests and removes fruit juice stains.
Which statements explain the shape of the graph at temperatures higher than X?
Bonds are broken between the R groups of the amino acids in the polypeptide chains of the enzyme.
There are more collisions between the enzyme and its substrate.
The tertiary structure of the enzyme is altered.
The shapes of the active site and the substrate are no longer complementary.
Which statement about the behaviour of chromosomes during mitosis is correct?
They attach to the spindle fibres to contain them within the nucleus
They condense to prevent further translation of genes.
They reach the poles of the cell and become longer and thinner.
They replicate to produce sufficient DNA to form two new nuclei.
What is the smallest unit of a DNA molecule that can be altered by a mutation and cause a change to the coding of a polypeptide?
base
codon
gene
nucleotide
The diagrams represent transverse sections of three plant organs.
A
B
C
D
Which statements about water movement in plants are correct?
1 Water can pass through cellulose cell walls.
2 Water can pass through lignified cell walls.
3 Water cannot pass through suberin in cell walls.
1, 2 and 3
1 and 2 only
1 and 3 only
2 and 3 only
The contraction of the heart is coordinated through electrical impulses passing through the cardiac muscle. Which is the correct order of part of the sequence of these impulses?
A right and left atria → sinoatrial node → atrioventricular node → ventricular walls
B sinoatrial node → right and left atria → atrioventricular node → Purkyne tissue
C sinoatrial node → right and left atria → Purkyne tissue → atrioventricular node
D sinoatrial node → right and left atria → Purkyne tissue → ventricular walls
A
B
C
D
The graph shows oxygen dissociation curves of adult oxyhaemoglobin in different carbon dioxide concentrations, 1 and 2.
Which conditions could change the shape of curve 1 to the shape of curve 2?
high carbon dioxide concentration causing a decrease in pH
high carbon dioxide concentration causing an increase in pH
low carbon dioxide concentration causing a decrease in pH
low carbon dioxide concentration causing an increase in pH
Which characteristic of the human gaseous exchange surface and the lungs, maintains the necessary concentration gradients for carbon dioxide and oxygen?
good ventilation of the lungs
large surface area of the alveoli
low resistance to air flow
the walls of the alveoli are thin
A student carried out four tests for biological molecules on a solution. The observations are shown in the table.
Which molecules may be present in this solution?
glucose, starch, protein
lipid, protein, glucose
protein, starch, sucrose
starch, protein, lipid
Which description is correct?
A collagen molecule has a high proportion of the amino acid glycine, which has a very small side chain
A group of three collagen fibres forms a strong, insoluble coiled structure termed a triple helix
Each of the collagen polypeptides in a collagen molecule has a regular spiral arrangement of many alpha helices.
Peptide bonds are present between amino acids of the same polypeptide and between the different polypeptides forming the collagen molecule.
The graphs show the rate of reaction of an enzyme-catalysed reaction.
Which graph shows the effect of increasing the concentration of the substrate at two different concentrations of a competitive inhibitor?
A
B
C
D
The diagram shows the transport of ions across the cell surface membrane.
Inside the cell there is a low concentration of sodium ions (Na+ ) and a high concentration of potassium ions (K+ ). Outside the cell there is a low concentration of K+ and a high concentration of Na+ .
The carrier molecule is a pump which exchanges Na+ for K+ .
A
B
C
D
The diagram shows transverse sections of two plant structures.
A
B
C
D
Two species of animal are found in the same area of forest and grassland. In the spring and summer they eat the same plant food.
However, in the autumn and winter one eats nuts in the forest and the other eats roots on the grassland. Both species are preyed upon by the same predator. Numbers of root-eating animals are reduced most by this, but they recover faster since they reproduce faster.
What can be concluded about these two species of animals?
1 They are part of the same community.
2 They are at different trophic levels.
3 They occupy different habitats.
4 They have different niches.
1, 2 and 4
2, 3 and 4
1 and 2 only
1 and 4 only
