Practice Paper 1 (DP IB Biology: HL)

Study the diagram below.

Which of the following table rows correctly identifies I - VI?

Which of the following correctly identifies the process that allows prokaryotic cells to reproduce?

Each of the following events takes place during mitosis.

In which order do the events take place?

Which of the structures in Diagram 2 correctly shows the structure of β-glucose and of α-glucose?

Diagram 2

The aquatic crustacean the water flea (Daphnia magna, pictured below) has a heart that pumps blood-like liquid called hemolymph around its body cavity.

Which statement about Daphnia magna's circulatory system is correct?

The diagram below shows a component of a triglyceride.

Which of the following correctly identifies this component?

Which row of the table best classifies common proteins with differing numbers of polypeptide chains?

During the process of semi-conservative replication of DNA, which activity, relating to bonding, does not take place?.

Which statements best explain why the ABO blood system in humans is an example of co-dominance?

1. Allele I^A and the allele I^B are both expressed in the heterozygote/AB type blood.
2. Neither allele I^A or the allele I^B can mask the expression of the other allele.
3. There are three alleles of the gene that controls the blood group.
4. There are more than two blood groups.

Which of the following statements correctly describes meiosis?

Which of the following statements correctly describes co-dominance?

If one molecule of DNA goes through 5 PCR cycles in the thermocycler, how many copies of that molecule of DNA will be produced?

Which of the following statements about quadrat sampling are true? 

1. Sampling must be random to avoid bias.
2. Random samples can be achieved by closing your eyes and throwing a quadrat.
3. Quadrat sampling is only useful for small organisms.

A water quality investigation was carried out after some cases of heavy metal poisoning were detected in a countryside village with a river running through it. The investigators were trying to establish if poisoning was worse on the north or the south of the river.

The results from a chi-squared test were:

Critical values table:

What conclusions can be drawn from the information above?

What can be concluded from the graph shown?

Which of the following is not a reason for the evolution of melanism in peppered moths?

The table shows a short section of the DNA base sequence of three different species.

Which cladogram best represents the relationships between species 1, 2, and 3?

Which of the following animals can be classified in the phylum annelida?

Which is the correct reason that cellulose passes through the gut undigested?

A condition known as congenital adrenal hyperplasia (CAH) may affect the development of the genitals in female fetuses. These children lack an enzyme necessary to produce the hormones cortisol and aldosterone. Without these hormones the fetus will produce more male sex hormones, such as testosterone, during their development.

What effect would this have on the development of a female fetus?

Which of the following describes the apoplast route along which sucrose is loaded into phloem sieve tubes?                               

1. H⁺ ions are actively pumped out of the companion cell
2. Sucrose travels along plasmodesmata to the companion cell
3. H⁺ ions flow down their concentration gradient through a co-transporter protein
4. Sucrose is carried across a sieve tube membrane

The following steps describe the role of gibberellin in seed germination.

1. Maltose is converted into sucrose and glucose for transport in the germinating seed.
2. Several genes are expressed that code for a series of enzymes.
3. Gibberellin is produced, influencing growth and enzyme production in the embryo.
4. These products are used to produce ATP and to build up the tissues of the growing plant.
5. Amylase breaks down insoluble starch within the food stores of the germinating seed.

Which of the following represents the correct sequence of these steps?

Which row of the table puts these DNA-containing structures into the correct order of size?

In a breeding experiment, a tall, round seeded (homozygous dominant) pea plant was crossed with a short, wrinkled seeded (homozygous recessive) pea plant. The F₁ dihybrid plants were then used in a test cross.

If the genes are always linked and no crossing over occurs, what would be the predicted ratio in the F₂ generation?

What would be the most accurate description of the following graphs?

Which of the following meristems is correctly matched with the tissue that it can form?

The statements below refer to the functions of antibodies:

1. Antibodies can combine with viruses inside cells to prevent them from damaging cells.
2. Antibodies can attach to flagella to make the bacteria less mobile.
3. Antibodies with single binding sites can cause agglutination of bacteria.
4. Antibodies can, with other molecules, make holes in the cell walls of bacteria.
5. Antibodies can coat bacteria to mark them for phagocytosis.
6. Antibodies can neutralise toxins.

Which of these statements are not correct?

The image below shows a test strip used for drugs testing. Unlike the hormone in a pregnancy test, the substances tested for in this kind of drugs test are too small to bind to more than one antibody at the same time. This type of test is known as a competitive binding assay.

The components of the test contain the following:

Conjugate pad - antibodies complementary to the drug being tested for. The antibodies are attached to a coloured bead.

Test line - bound molecules of the drug being tested for.

Control line - bound antibodies complementary to the antibody from the conjugate pad.

Which of the following correctly explains the appearance of a positive result?

The majority of the eukaryotic genome contains non-coding regions of DNA.

 Which of the following are functions of non-coding DNA?

Which of the following is not a function of tRNA?

Which of the following correctly identifies the location of the light-dependent reactions?

In an investigation into the impact of enzyme inhibition on respiration, scientists used a molecule to inhibit transcription of the gene that codes for the enzyme LDHA.

Using the diagram, identify the likely effect this would have on the process of respiration.

1. Increased production of lactic acid
2. A build up of pyruvate in anaerobic conditions
3. Increased activity of the Krebs cycle in aerobic conditions

The masseter is the strongest muscle in the human body and is responsible for lifting the lower jaw to close the mouth. The location of the masseter can be seen in the diagram.

Which of the following is not an event which would occur in the masseter as the jaw is moved towards its closed position?

Which of the following statements correctly describes a process that takes place in the excretory systems of land insects?

Which of the hormone functions shown below are correct?

The three graphs below show how the allele frequencies of two alleles in three different populations changed over several generations.

Which of the graphs show changes in allele frequency that suggest that evolution is taking place?

The image below shows two structures commonly found in mammals. A light microscope was used to view the sample.

Identify the structures labelled X and Y along with one correct feature of these structures.

Why is it difficult to show a causal link between a risk factor and a particular disease?

It is estimated that the human genome contains between 20 000 and 25 000 genes. However, the proteome is estimated to contain up to 400 000 proteins. This large difference in numbers is due to alternative splicing.

Which of the following best describes alternative splicing in eukaryotes?