Practice Paper 1 (DP IB Biology: SL)

The image below shows an electron micrograph of a specialised cell.

Based on the image, which of the following would correctly identify the function of this specialised cell?

Which row correctly matches the molecules found in the cell surface membrane with their function?

The diagram shows the chromosomes of a squashed cell during mitosis.

Which stage of mitosis is the cell in and what is the haploid chromosome number of this species?

The graph shows the survival probabilities for current smokers and for those who never smoked among men 20 to 70 years of age.

What can be concluded from this graph?

The diagram below shows several different biological molecules (Q, R, S and T).

Which row of the table below correctly identifies some of the products of hydrolysis of the molecules above?

Which of the options below refers to the features of catabolism?

Which row of the table below contains two correct statements?

Which of the rows in the following table correctly identifies the function of each enzyme listed?

The rate of oxygen consumption was compared in yeast cells incubated with and without glucose at three different temperatures under aerobic conditions. The yeast cells were incubated for a period of 3 minutes during which the rate of O₂ consumption was measured with an O₂ sensor.

What can be concluded from the results of this experiment?

Paper chromatography can be used to separate photosynthetic pigments obtained from chloroplasts. The chromatography strip shows distinct coloured pigment bands. Which pigments are represented by bands 3 and 4?

The effect of different colours of light on the growth of Arabidopsis thaliana (thale cress) seedlings was studied. Three different colours of light were tested and measurements of seedling height, shoot length, and biomass were taken.

What conclusions can be drawn from the data?

Cytochrome C is a protein which is common to all organisms and is therefore a useful gene sequence to study when constructing phylogenetic trees to represent evolutionary relationships.

The table shows the number of nucleotide differences in the cytochrome C genes of several different species.

Which of the following shows the correct order of the organisms if arranged from the most closely related to the least closely related compared to humans?

Which of the following sets of statements correctly describes a process that would now be used for karyotype analysis?

A species of plant can have either blue or white flowers. The colour of the flower is controlled by a single gene where the dominant allele codes for blue flowers. 

Two heterozygous plants are crossed; which of the observed outcomes matches up most accurately to the expected ratio of blue to white flowers. 

The pedigree chart below shows the inheritance of Tay-Sachs disease which is an autosomal recessive trait, characterised by neurological problems caused by the death of nerve cells. 

In the pedigree chart a filled in circle or square means the individual is affected and shows the genetic condition.

What is the probability that individuals 3 and 4 will have another child with Tay-Sachs disease?

The graph shows changes in percentage cover of four plant species on a sand dune ecosystem over 500 years.

Which of the following explanations cannot be supported using the information in this graph.

The diagram below shows the stages of the carbon cycle.

Which processes are shown in the diagram?

Different greenhouse gases have different global warming potential, or GWP.

 Which factors contribute to the global warming potential of greenhouse gases?

The image below shows a series of fossils.

How does this set of fossils provide evidence for evolution?

Several species of lava lizard of the genus Microlophus are found only in the islands of the Galapagos. A group of scientists recorded the mating displays of male lava lizards in different parts of the Galapagos, using the amplitude of a wave to represent the height and length of head bobbing behaviour. The map shows the mating displays of some male lava lizards currently living on different islands of the Galapagos.

Which of the following statements about mating displays in Galapagos lava lizards are correct?

I. Mating displays are the same between members of the same species of lava lizard

II. Mating displays show continuous variation across the geographical range of the Galapagos lava lizards

III. The mating displays suggest that lava lizards evolved by gradual divergence from a common ancestor

IV. The mating displays recorded show all the stages of lava lizard divergence

To which plant phylum does the plant in the diagram belong, and why?

Which of the following is not an important reason for the binomial system of naming organisms?

Which row of the table correctly states the monomers which combine to form the disaccharide named?

The graph shows changes in pressure at various stages of the cardiac cycle.

Which statement describes the events at point Y of the graph?

Which are chambers of the heart?

I. Atrium
II. Aorta
III. Ventricle
IV. Lumen

Which of the following is not a contributing factor towards the development of antibiotic resistance in bacteria?

An alveolus has several features to allow efficient gas exchange.

Which row of the table below matches each feature of gas exchange to the correct label on the alveolus?

A research group of geneticists found a fruit fly mutant that shakes vigorously when anaesthetized with ether. Their studies showed that the shaker mutant has K⁺ channels that do not function properly. An action potential of a normal fruit fly and a shaker mutant is shown below.

Which of the following statements (I - IV) could be possible explanations for the differences between the action potentials?

I. The faulty K⁺ channels don't open for as long so there is slower diffusion of K⁺ ions.

II. The faulty K⁺ channels may be opening early, preventing maximum depolarisation.

III. The faulty K⁺ channels cause K⁺ ions to diffuse back into the axon more slowly, resulting in slower repolarisation.

IV. In wild-type drosophila, the functioning K⁺ channels allow for a faster rate of depolarisation.

A one year old child displays fatigue and excessive thirst over a period of time. A urine test reveals the presence of glucose.

Which of the following would be the most likely diagnosis?