OCR GCSE Combined Science A (Gateway) Biology Paper 1 Foundation June 2018 question paper J250/01

Which substances are used in the synthesis of lipids ?

A Amino acids and glucose

B Amino acids and glycerol

C Fatty acids and glucose

D Fatty acids and glycerol

The drawing shows some of the structures found in an animal cell.

Which labelled structure contains enzymes for cellular respiration?

Which substances are transported in the phloem vessels?

A Sucrose only

B Water and mineral ions

C Water and sucrose

D Water only

The diagram shows a potometer.

Why is structure X needed?

A Maintains temperature of the apparatus

B Provides the plant with mineral ions

C Returns the air bubble to its original position

D Sucks water up from the beaker

Look at the diagram of a potometer.

How can the apparatus be changed to increase the rate of water uptake?

A Add more water to the beaker

B Place an electric fan next to the apparatus and switch the fan on

C Place a plastic bag over the plant

D Remove half of the leaves from the plant

A student investigates osmosis. They place potato chips in different sugar solutions.

The table shows their results.

What is the percentage change in mass for the potato chip in sugar solution Z ?

A −7

B −15

C −18

D −30

The level of some hormones change during the menstrual cycle.

The graph shows how the level of one hormone changes during the menstrual cycle.

Fertilisation has not taken place after ovulation.

Which hormone is represented in the graph?

A FSH

B Oestrogen

C Progesterone

D Testosterone

Which of these carbohydrates is a polymer ?

A Glucose

B Maltose

C Starch

D Sucrose

The picture shows plant cells as seen using a light microscope.

Draw a large labelled diagram of cell X.

The plant cells shown in Fig. 11.1 are not root cells.

Explain how you can tell this from the picture.

A plant is growing in a soil of pH 4.

Which mineral ion will be most available to the plant?

Magnesium is required by plants for photosynthesis.

Growing plants in very alkaline soils may result in less biomass.

Use the chart to explain why.

The picture shows a root growing from a seed.

Explain how the structures seen on the root help with the uptake of minerals.

The diagram shows a motor neurone.

Label 1 and 2 on the diagram.

Nerve impulses can travel along axons at different speeds.

The graph shows the relationship between the speed of a nerve impulse and the diameter of the axon.

Describe the relationship between diameter and speed of impulse.

The data was measured as part of an investigation by a scientist. The scientist made this statement.

‘The data collected is mostly precise.’

What evidence is there in the graph to support this statement?

The table compares type 1 and type 2 diabetes.

	Type 1	Type 2
Usual age of onset	...........................................	Adult
Development of symptoms	Very quick	May appear over several months
Percentage of diabetic population	About 10%	About 90%
Linked to obesity	Rare	Common
Cause	Beta cells ( cells) destroyed so no insulin production	Body cells may not react to insulin or not enough insulin is produced

State the usual age of onset for Type 1 diabetes.

Write your answer in the table.

Which organ in the body contains beta cells ( cells)?

Write about the different treatments for the two types of diabetes.

Amino acids are found in the food we eat. Different diets will contain different amounts of amino acids.

The table shows some of the amino acids we need in our diet. It also shows the mean daily intake of one adult male and the recommended daily allowance (RDA) for the same man.

Which amino acid has the lowest RDA?

Calculate the mean intake as a percentage of the RDA for lysine.

Explain why this man’s intake of lysine may affect his health.

Which gas makes the bubbles?

* The students think they could improve their method.

They will count the bubbles three times at each temperature. This would show up any anomalous results.

Describe other ways they could improve their method to obtain more precise and repeatable results.

For each improvement explain why it is needed.

The students count the bubbles three times at each temperature. They then calculate the mean number of bubbles at each temperature.

The table shows their results.

Plot the results on the grid.

Draw a line of best fit.

Respiration is an enzyme controlled reaction.

Use ideas about enzymes to explain the pattern in the results.

This question is about circulatory systems.

The picture shows three different blood vessels X, Y and Z, seen using a light microscope.

Compare blood vessels X and Z and describe the differences that can be seen in the picture.

Blood vessel Y is a capillary. Explain how the structure of a capillary is adapted to its function.

Lungfish are fish that have both gills and a lung.

When in water, the blood flows through the gills. When on land, blood flow to the gills is stopped and the blood enters the lung instead.

The diagram shows the circulatory system of a lungfish.

The lungfish circulatory system is different to that of humans.

Blood in the lungfish can flow through gills and lungs, humans only have lungs.

Write down one other way the structure of the lungfish circulatory system is different to that of humans.

When lungfish and humans are on land, the human circulatory system is more efficient than that of lungfish.

Suggest why the human circulatory system is more efficient.

The diagram shows a cell during one stage of mitosis.

Describe two things that happen to the chromosomes in the next stage of mitosis.

Chromosomes are made of DNA.

Describe the structure of DNA.

After mitosis, cell differentiation takes place.

What is meant by the term cell differentiation ?