human bio test

7/30/2019 Human Bio test

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Answer all questions

1. (a) The table lists the names of different structures found within a human.

Complete the table by numbering each structure in order of its size. Use number 1 for the smallest

structure through to number 4 for the largest.

(4)

(b) For following questions, choose the most appropriate and underline.

(i) The basic functional unit of all organisms is

a. Nucleusb. Cellc. Tissued. Organ

(ii) All chemical processes that occur in a cell is collectively called as .

a. Cell reactionsb. Metabolismc. Anabolismd. Catabolism


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(iii) A majority of the chemical processes of cells are regulated by

a. Hormonesb. Waterc. Enzymesd. Pheromones

(iv) Enzymes are . which act as ., lowering the

.

a. Biocatalysts, proteins, speedb. Proteins, chemicals, activation energyc. Chemicals, bio catalysts, activation energyd. Proteins, bio catalysts, activation energy

(v) All life processes are

a. Chemical reactionsb. Generating heatc. Activities which maintain lifed. Metabolic reactions maintaining life

(vi) Efficiency of enzyme actions can be increased by

a. Temperature and heatb. Temperature, pH and heatc. Temperature, pH and surface area exposedd. Temperature and pH

(6)

Total 10 marks


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02.Following is a cell of an organism.

(a) Identify the cell and justify your answer by providing 2 reasons?

(3)

(b) Explain the functions of the following organelles.

Golgi body:

(2)


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Mitochondria

(2)

Endoplasmic Reticulum (ER)

(2)

(c) Explain the difference between a permanent vacuole and vacuole of the diagram.

(1)

Total 10 marks

03. Transport of material occurs through exchange surfaces such as cell membranes.(a) Explain 3 external factors that will increase the efficiency of movement(i) Factor (1) ..

How it affects:

(3)


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(ii) Factor (2) ..

How it affects:

(3)

(iii) Factor (3) ..

How it affects:

(3)

(b) Name the three key modes of material transport:

(3)


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(c)

LEFT RIGHT

Explain the processes by which molecules A, B, C & D move through the membrane and the direction of

movement.

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(Total 16 marks)


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04.(a) What is meant by the term tissue? Explain your answer with reference to two namedexamples.

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(b) What is an enzyme? Explain why enzymes are important in living organisms.

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(6)

Total 11 marks


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4. A student tests some food samples for protein.

(a) He uses the piece of apparatus shown below to measure the reagent.

(i)Name this piece of apparatus.

................................................................................................................................ (1)

(ii)He measures out 3 cm3of the reagent. Draw a line on the diagram to show the level of thereagent.

(1)

(b) The student tested two foods, A and B, for protein.

(i) Name a reagent he could use.

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(1)


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(ii) He obtained the following results. Complete the table below to show the colours obtained.

(c) The diagrams below show the apparatus used by a student to investigate the digestion of starch at

two different temperatures.


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(i) What is the temperature at which each starch and human amylase mixture is being incubated?

A ..............................................................................................................................

B ..............................................................................................................................

(2)

(ii) The student removed a small sample of the starch and amylase mixture from each test tube every

two minutes. Each sample was tested for the presence of starch. The student wished to show the results

of the tests in the form of a table.

Draw a table, with the correct headings, that will allow the student to record his test results.

(4)

(ii) State in which of the two mixtures the starch would be digested most quickly and explainwhy.

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(3)

Total 14 marks


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5. Describe an experiment you could do to find out the effect of pH on the growth of yeast.

(you need to take into consideration the involvement of enzymes in cell metabolism)

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(Total 10 marks)


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06. Starch and glucose are carbohydrates found in living organisms. Complete the table to show some

of the properties of starch and glucose. Insert a tick () if the property applies or a cross (x) if it does

not.

(5)

(i) Describe how you could test for the presence of glucose in a substance.

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(3)

(ii) Give two safety precautions you would take when carrying out the test.

1

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2

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(2)

(Total 11 marks)


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07. Epithelial cells form a lining to structures in the body and there are several types of epithelial cell.

(a) (i) Draw a labelled diagram to show the structure of a cell from the lining inside yourcheek.

(4)

(ii) Describe and explain differences in the structure and functions of epithelial cells from the lining of

the cheek and the lining of the trachea.

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(6)

(Total 10 marks)


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08. A student took a sample of RBC cells and placed them in following manner

Sample A - 60% Salt solution

Sample B Distilled water

a. Explain the appearance of RBC cells in two different liquids after few minutes

RBC in 60% salt solution

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RBC in Distilled water

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(b) Explain how you can maintain the RBC cells in its original condition.................................................................................................................................

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(2)

Total 8 marks

Total marks 100

human bio test

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