NEW
Font size
WorksheetsIB Biology SL Paper 1
Total questions: 30
Worksheet time: 17mins
The electron micrograph shows a thin section through a plant mesophyll cell.
× 75
× 300
× 3000
× 7500
By which process do potassium ions move through potassium channels in axons?
Active transport
Exocytosis
Facilitated diffusion
Simple diffusion
Which statement provides evidence for endosymbiosis?
Early prokaryotes contributed to a large increase in oxygen in the atmosphere.
Eukaryotic mitochondria and chloroplasts have their own circular DNA.
Certain groups of ancient prokaryotes developed mechanisms to carry out aerobic
respiration.
Experiments by Miller and Urey produced simple organic molecules in abiotic conditions.
In the micrograph, which letter points to a cell in anaphase?
A
B
C
D
Students examined micrographs and counted cells in the different stages of mitosis as well
as those cells with no visible chromosomes. The table shows their results.
0.2
0.4
0.6
0.7
In which processes are macromolecules broken down into monomers?
Anabolism and catabolism
Catabolism and hydrolysis
Hydrolysis and reduction
Reduction and anabolism
Which of the molecules shown would be most suitable for long-term energy storage in humans?
A
B
C
D
What is a property of water?
Water has a low specific heat capacity so large increases in heat energy cause a small
temperature change.
Water is an excellent solvent for non-polar substances.
Covalent bonds between adjacent water molecules are responsible for its unique properties.
Water molecules are highly cohesive which is important for transport in xylem.
Using the nomogram, what is the minimum mass at which a woman of height 165 cm would
be considered overweight?
72
67
64
61
What effect do changes in pH have on enzymes?
All enzymes increase in activity as pH increases.
The activity of all enzymes is reduced by a pH below or above 7.
Low pH causes reversible denaturation in all enzymes.
Extreme pH can alter the active site of all enzymes.
For what did Meselson and Stahl’s work provide evidence?
The abiotic origin of organic molecules
The cell theory
The fluid mosaic model of membrane structure
The semi-conservative replication of DNA
Which compound is a waste product of anaerobic respiration in humans?
Carbon dioxide
Ethanol
Lactate
Pyruvate
The diagram shows a respirometer used to measure respiration rate in germinating seeds.
A
B
C
D
The child is female with Down syndrome.
The child is female without Down syndrome.
The child is male with Down syndrome.
The child is male without Down syndrome.
A variety of Pelargonium has yellow leaves. When plants of this variety are crossed, the
resulting seeds produce green, yellow and white seedlings in the ratio 1 : 2 : 1. If plants with
yellow leaves are crossed with plants with green leaves, what would the expected ratio of
phenotypes in the offspring be?
A
B
C
D
A pair of alleles controls the secretion of antigens corresponding to blood group in saliva.
Examine the pedigree chart.
Dominant
Recessive
Sex-linked
Co-dominant
What is PCR used for?
Separate fragments of DNA by size
Amplify small amounts of DNA
Compare DNA samples
Genetically modify organisms’ DNA
What is the ecological term for a group of different types of organisms that live together and
interact with each other?
Community
Domain
Ecosystem
Population
A
B
C
D
What material is formed when organic matter is not fully decomposed in acidic waterlogged soils?
Coal
Hydrogen
Oil
Peat
Which pentadactyl limb is adapted for flight?
A
B
C
D
An organism has the following characteristics:
-single opening for ingestion and egestion
-radial symmetry
-tentacles with stinging cells.
In what phylum would it most likely be classified?
Annelida
Cnidaria
Platyhelminthes
Porifera
Which organism is a member of the filicinophyta? (Note that these are not drawn to scale)
A
B
C
D
The micrograph is of a longitudinal section through the small intestine. Which letter
represents the circular muscle layer?
A
B
C
D
Which part of the body secretes amylase, lipase and endopeptidase for use in the digestion
of food?
Mouth
Pancreas
Stomach
Small intestine
The diagram shows the human heart.
I → II → III → IV
II → I → IV → III
IV → III → I → II
IV → III → II → I
What is non-specific immunity to disease?
Blocking prokaryotic metabolism with antibiotics
Production of antibodies by lymphocytes
Endocytosis of pathogens by white blood cells
Production of cloned plasma cells
The graph shows an action potential.
–80 mV
–70 mV
–55 mV
40 mV
What is the role of the hormone leptin?
To regulate the metabolic rate
To inhibit appetite
To control circadian rhythms
To increase blood sugar concentration
On the graph, which curve represents the change in FSH levels during the menstrual cycle?
A
B
C
D
