biology paper 1&2 core evolution,chemestryof life, population, enzymes, adn, photosyntesis 11dp...

EJE 1 All statements baccalaureate international 2011 ©

Name Student:

Biology

Standard Level

Paper I& II

1 hour 30 minutes

Tuesday 06 December 2011

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

A. Between observed and expected results

Puntos Nota 20-20 7 17-19 6 14-16 5 12-13 4 8-11 3 4-7 2 1-3 1

Puntos Nota 36-36 7 30-35 6 25-29 5 19-24 4 12-18 3 6-11 2 0-5 1


B. Between the means of two samples

C. Between the standard deviation of two samples

D. Between the size of two samples

2. 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

3. Which molecule is shown below?


A. Glucose

B. Galactose

C. Ribose

D. Sucrose

4. 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

5. 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.

6. On which molecule is a codon found?

A. Polypeptide

B. mRNA

C. tRNA

D. rRNA


7. 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

8. The following diagram shows part of a food web from Yellowstone Park.

What would be the short-term effects on the populations of the other species if the gray wolf

were exterminated?

9. Which process tends to reduce variety within a population?

A. Natural selection


B. Random fertilization

C. Independent assortment

D. Crossing over

10. The diagram below shows a population growth curve.

At which time in the population growth curve does the population size begin to decline?

A Between the time marked 1 and 2

B. During the time marked 2

C Between the time marked 2 and 3

D. The graph does not show a time when population size declines

11. Population growth, as shown by the curve below, is the result of changes in mortality, natality,


immigration and emigration. Which of the following statements about population growth is

correct?

A. In phase I there is no mortality.

B. In phase II mortality equals natality and immigration equals emigration.

C. In phase II mortality and emigration are less than natality and immigration.

D. In phase III mortality and emigration are less than natality and immigration

12. Which process is used in polymerase chain reaction (PCR)?

A. Transcription

B. Translation

C. Replication

D. Mutation

13. Which enzymes are needed to incorporate genes into plasmids to create recombinant

plasmids?

A. DNA polymerase and ligase

B. DNA polymerase and restriction enzymes

C. Restriction enzymes and ligase

D. Helicase and restriction enzymes

14. 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.

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

A. Blue

B. Green

C. Yellow

D. Orange

16. 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

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

18. Which of these molecules is a disaccharide?


A. Galactose

B. Sucrose

C. Cellulose

D. Ribose

19. 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

20. 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


Models predict global warming will cause sea temperatures to rise by approximately 2 °C

by 2100. An investigation was carried out to study the effect of slight increases in

temperature on the ability of Antarctic marine molluscs to carry out basic activities

essential for survival.

The graph below shows the effect of temperature on the percentage of limpets

(Nacellaconcinna) able to right themselves after being turned over.

a. Outline what the two parts of the scientific name Nacellaconcinnarefer to. [1]

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b. State the relationship between temperature and the percentage righting in N. concinna[1]

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c. Estimate the percentage change of N. concinnaable to right themselves when the

temperature is raised from 0 ºC to 2.5 ºC. [1]

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. (This question continues on the following page)

(Question 1 continued)


d. At present, the maximum summer temperature in the normal Antarctic environment of

this organism is 1ºC. Suggest what might be the effect on the survival of this organism

ifthe predicted rise in sea temperature due to global warming occurs.[2]

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2. a. Define population. [1]

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b. Draw a box diagram to show the effects of natality, mortality, immigration and emigration

on a population [5]

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c. State three factors that set limits to population growth. [3]

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3.a. Define enzyme and active site. [2]


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b. Explain enzyme–substrate specificity [3]

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c. State one role for each of the elements [5]

Sulphur

Calcium

Iron

Sodium

Phosphorus


Section B

4. Explain two examples of evolution as a response to environmental change. [6]

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5. Outline the evidence for evolution provided by homologous structures. [6]

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