Biology paper 1&2 chemestryof life, enzymes, adn, photosyntesis 10 dp eje mar 2012

EJE 1 All statements baccalaureate international 2011 ©

Name Student:

Biology

Standard Level

Paper I& II 10 DP

1 hour 30 minutes

March 2012

INSTRUCTIONS TO CANDIDATES

Do not open this examination paper until instructed to do so.

Answer all the questions.

Answer all in the spaces provided.

Use pen only

Use clear handwriting

Paper I

Paper II

Paper I

1. What do error bars on graphs show?

Puntos Nota 23-25 7 20-22 6 17-19 5 14-16 4 8-13 3 4-7 2 1-3 1

Puntos Nota 33-36 7 30-32 6 25-29 5 19-24 4 13-18 3 5-12 2 0-4 1


A. If the data is correct or not.

B. How variable the data is.

C. Which result is closest to the true result.

D. What statistical technique was used to eliminate incorrect results.

2. What is the correct order of increasing size for the following biological structures?

I. The width of a virus

II. The width of a bacterium

III. The thickness of a cell surface membrane

IV. The diameter of a eukaryotic cell

A. I → III → II → IV

B. I → III → IV → II

C. III → I → II → IV

D. III → II → I → IV

3. The diagram shows part of a molecule produced by replication of DNA. What is the significance of the

shaded and the unshaded regions?

A. The shaded parts are DNA and the unshaded parts are mRNA.

B. The shaded parts contain adenine and thymine and the unshaded parts contain guanine

and cytosine.

C. The shaded part is a codon and unshaded part is an anticodon.

D. One of the parts has been newly synthesised and the other was part of a pre-existing

DNA molecule.


4. If mRNA has a codon CAU, what is the corresponding anticodon on the tRNA molecule?

A. CAT

B. GUA

C. CAU

D. GTA

5. Which graph shows the relationship between the substrate concentration and the rate of an

enzymecontrolled reaction?

6. What are pyrimidines in DNA?

A. Types of nucleotides

B. Types of base pairs

C. Types of sugars

D. Types of bases

7. Which enzyme removes the RNA primer during replication?


A. RNA primase

B. DNA polymerase I

C. DNA ligase

D. Helicase

8. The diagram below summarises the light-dependent reactions in photosynthesis. What is occurring

at X?

A. ADP + phosphate → ATP

B. NADP+→NADPH + H+

C. H2O → O2- + 2H+

D. NADPH + H+ → NADP+

9. What is the first identifiable product of carbon dioxide fixation in photosynthesis?

A. Ribulosebisphosphate (RuBP)

B. Glycerate 3-phosphate (GP)

C. Triose phosphate (TP)

D. Acetyl CoA

10. Which of the following structures are present in both plant and animal cells?

I. Cell wall


II. Chloroplast

III. Mitochondrion

A. I only

B. I and II only

C. I and III only

D. III only

11. Which of the following is a feature of exocytosis but not endocytosis?

A. Shape changes of a membrane

B. Vesicle formation

C. Use of ATP

D. Secretion

12. The t-test is used to test the statistical significance of a difference. What is that difference?

A. Between observed and expected results

B. Between the means of two samples

C. Between the standard deviation of two samples

D. Between the size of two samples

13. What does the following scatter graph show?

A. No correlation between these variables

B. Strong positive correlation between these variables


C. Strong negative correlation between these variables

D. Weak negative correlation between these variables

14. Which molecule is shown below?

A. Glucose

B. Galactose

C. Ribose

D. Sucrose

15. What is replicated by a semi-conservative process?

A. Messenger RNA (mRNA) only

B. Messenger RNA (mRNA) and transfer RNA (tRNA) only

C. Messenger RNA (mRNA), transfer RNA (tRNA) and DNA only

D. DNA only

16. If 15 % of a sample of DNA is thymine, what percentage of the DNA is guanine?

A. 15 %

B. 30 %

C. 35 %

D. It cannot be determined from the information given.

17. On which molecule is a codon found?

A. Polypeptide

B. mRNA

C. tRNA

D. rRNA

18. Which of the following processes produces CO2?


I. Glycolysis

II. Alcohol (ethanol) fermentation

III. Lactic acid production

A. I only

B. II only

C. I and II only

D. I, II and III

19. What could be achieved by DNA profiling using gel electrophoresis?

A. The chromosome number of an organism could be counted.

B. It could be shown that human tissue found at the site of a crime did not come from a person

suspected of having committed the crime.

C. A karyotype could be produced.

D. Extinct species of living organisms could be brought back to life.

20. Which of the following colours of light is absorbed the most by chlorophyll?

A. Blue

B. Green

C. Yellow

D. Orange

21. What is light energy used for during photosynthesis?

A. To produce carbon dioxide

B. To produce water molecules

C. To produce ATP

D. To break down sugar molecules

22. Which diagram represents the polarity of a water molecule?


23. Which of these molecules is a disaccharide?

A. Galactose

B. Sucrose

C. Cellulose

D. Ribose

24. What is a codon?

A. A sequence of nucleotides on rRNA that corresponds to an amino acid

B. A sequence of nucleotides on mRNA that corresponds to an amino acid

C. A sequence of nucleotides on tRNA that corresponds to an amino acid

D. A sequence of nucleotides on DNA that corresponds to an amino acid

25. What happens as an enzyme becomes denatured?

A. The enzyme works faster.

B. The enzyme works slower.

C. The enzyme can perform a new role.

D. The enzyme can make the reverse reaction proceed faster

Paper II

Section A


1. Outline the effects of temperature, light intensity and carbon dioxide concentration on the rate of

photosynthesis (sketch and annotate a graph for each one)

a. Light intensity [4]

b. Temperature [4]

c. Carbon dioxide concentration [4]

2.

a. Define enzyme and active site. [2]


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b. Explain enzyme–substrate specificity [3]

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c. State that ATP and hydrogen (derived from the photolysis of water) are used to fix carbon

dioxide to make organic molecules [5]

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Section B

3.

(a) Draw and label a diagram of the molecular structure of DNA. [6]


(b) Discuss factors that affect enzyme activity. [4]

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(c) Compare the structure and composition of DNA with RNA. [4]

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Biology paper 1&2 chemestryof life, enzymes, adn, photosyntesis 10 dp eje mar 2012

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