Practice Paper 1 (DP IB Biology: SL)

The diagram shows part of an RNA molecule. 

Which row of the table below is correct?

An experiment to calculate the osmolarity of potato was performed using the following protocol:

1. Dice potato into 1cm³ cubes.
2. Add potato cubes to 6 test tubes, each containing solution with a different sucrose concentration.
3. Wait 12 hours.
4. Weigh the cubes from each test tube and plot a graph. 

The mean mass of the potato cubes was 2.50g before being added to solution and the graph shows the masses of potato cubes after the experiment.

What concentration of sucrose has the same osmolarity as the potato?

Which of the following ideas are part of cell theory?

1. Cells are the smallest unit of life.
2. Cells show great variety in shape and structure.
3. Cells are derived from other cells (pre-existing cells) by division.

The diagram shows a type of prokaryotic cell, a bacterium.

Which three structures are found in both an animal cell and this bacterium cell?

The sentence below describes a cellular process and an associated eukaryotic cellular structure.

 Cells which have a high rate of …I… will have many ...II… .

 Select the terms that best fit the gaps in this sentence.

Which of the following sequences of atomic symbols best represents the makeup of the elements in the human body, in descending order, by mass?

Trypsin is a digestive enzyme found in pancreatic juices that breaks down proteins into polypeptides in the small intestine. The image below represents the three dimensional structure of trypsin.

Image courtesy of 0fb1d8. Licensed under Creative Commons Attribution-Share Alike 4.0 International license. Reused and distributed under conditions found at: https://creativecommons.org/licenses/by-sa/4.0/deed.en

Which of the following would be the most accurate description of the conformation of trypsin?

Scientists extracted enzymes from different parts of the digestive tract of a mammal. The containers of enzyme samples got mixed up with each other before the scientists could label them. In order to identify the enzymes, they monitored the enzyme activity of each sample at different pH levels to determine the optimum pH for each.

The graph below shows the results for two of the samples (X and Y).

Which of the following would be the most valid conclusion that the scientists can draw from these results?

A student designed the following experimental set-up to measure the effect of light intensity on the rate of photosynthesis. The experiment was repeated three times.

The results were inconsistent, how could the experimental set-up be improved?

Two parents with normal factor VIII have a child with haemophilia.

Which is the correct statement?

How did Gregor Mendel ensure the reliability of his data?

Five events that take place during meiosis are listed.

Which is the correct chronological order (1 - 5) of those events?

Which statement can not be concluded from the DNA profile shown?

A possible research question on plant cloning could be: 

‘Does the position on the stem at which a cutting is taken affect its ability to form roots?’ 

Which variables would allow a valid investigation into this question?

Which row of the table correctly identifies an observation of food chains and the theory used to explain that observation?

Sickle cell anaemia is caused by the following mutation in the gene that codes for haemoglobin:

Which of the following correctly explains how this mutation causes sickle cell anaemia?

Which pyramid of energy correctly represents the food chain shown?

Algae → caddis fly larvae → small fish → kingfisher

Which of the following statements about the removal of carbon from the atmosphere are correct?

1. Atmospheric carbon is converted into carbohydrates during photosynthesis.
2. Carbon enters the cells of aquatic plants by diffusing directly from the surrounding water.
3. Carbon combines with water to form carbonic acid, which dissociates to form hydrogen carbonate ions, raising the pH of water.

Which of the following is not true about mesocosms?

Which of the following processes generate genetic variation?

1.  Random orientation
2. Mitosis
3. DNA replication
4. Random fertilisation

The pneumococcal conjugate vaccine (PCV13) provides protection against infection caused by the bacterium Streptococcus pneumoniae. The graph shows the number of cases of invasive pneumococcal disease (IPD) caused by antibiotic resistant S. pneumoniae before and after the introduction of PCV13.

Which statement correctly explains the number of cases of IPD caused by antibiotic resistant S. pneumoniae after the introduction of PCV13?

Which of the following parts of the digestive system produce and secrete protein-digesting enzymes into the alimentary canal?

Some scientists were investigating mitosis in plant cells.  They applied a chemical agent called colchicine, which interferes with tubulin proteins in the cytoplasm. An image of some chromosomes from a treated cell can be seen below.

How does treatment with colchicine prevent progression of cell division in plant cells?

The diagram shows the female reproductive system.

Which row correctly identifies the structures?

Which was a feature of Galen's theory of blood flow prior to his theory being superseded by that of William Harvey?

Which set of conditions is required to allow the intake of air into the lungs during ventilation?

Which of the following are roles of thyroxin?

1. Targets metabolically active regions, such as adipose tissue.
2. Increase the rate of protein synthesis.
3. Inhibits the appetite and reduces food intake.
4. Increase the generation of body heat.

An antibiotic sensitivity test was performed on bacteria isolated from a patient’s throat.

The diagram shows the results of the four antibiotics tested.

Which one should be used to treat the disease?