ib biology i summer packet 2017 - sphs advanced...

4/19/17 1:16 PMIB Questionbank

of 21https://questionbank.ibo.org/en/teachers/13194/questionbanks/43-dp-biology/teacher_tests/202979

IB Biology I Summer Packet 2017[119 marks]

1a. [1 mark]The diagrams show a virus and a bacterium.

Calculate the magnification of the bacterium.

1b. [1 mark]State the method that bacteria use to divide.

1c. [1 mark]Outline the effectiveness of antibiotics against viruses and bacteria.

1d. [1 mark]Saprotrophic organisms, such as Mucor species, are abundant in soils.

Define saprotrophic organisms.

1e. [1 mark]State one role of saprotrophic organisms in the ecosystem.

2a. [1 mark]The graph shows a sigmoid population growth curve.

Identify the phases labelled X and Y.

2b. [2 marks]Outline how fossil records can provide evidence for evolution.

2c. [1 mark]The table summarizes the genome size of several organisms.

Distinguish between the terms genotype and phenotype.

2d. [1 mark]Outline a structural difference between the chromosomes of Helicobacter pylori and Homo sapiens.

2e. [1 mark]Deduce the percentage of adenine in Oryza sativa if the proportion of guanine in that organism is 30 %.

2f. [1 mark]The figure shows a pedigree chart for the blood groups of three generations.

Deduce the possible phenotypes of individual X.

2g. [1 mark]Describe ABO blood groups as an example of codominance.

3. [3 marks]Discuss the evidence supporting the endosymbiotic theory for the origin of eukaryotes.

4a. [2 marks]Diabetes is often associated with the failure of the β (beta) cells in the pancreas, but it is unclear what actually causes this failure.

FoxO1 is a protein which acts as a transcription factor to regulate the expression of genes involved in cell growth. FoxO1 also regulates

increase in number and differentiation in cells such as pancreatic β cells.

A study was conducted using mice lacking the gene for FoxO1 in β cells (IKO) as well as normal (control) mice. Blood glucose levels afterfasting were compared for four groups of mice: young (3 months old) male mice, young (3 months old) female mice, older females (whohave had several pregnancies) and aging males (16–20 months).

Compare blood glucose levels after fasting in young control mice and young IKO mice without FoxO1.

4b. [1 mark]Estimate the difference between mean blood glucose levels in control and IKO older female mice.

.................mg ml

4c. [2 marks]Aging and having pregnancies are considered to be physiological stresses. Deduce the effect of stress on blood glucose levels.

4d. [2 marks]Outline the relationship between blood glucose levels after fasting and lack of FoxO1 in the mice studied.

4e. [1 mark]The levels of pancreatic hormones and β cell mass in older female control mice and older female IKO mice lacking FoxO1 were

then investigated.

State the correlation between lack of FoxO1 and pancreatic hormones in mice.

4f. [3 marks]Referring to the functions of insulin and glucagon, suggest how the differences in hormone levels help to explain the blood

glucose levels.

5a. [1 mark]Milk contains lactose which some people can digest but some cannot.

State what type of sugar lactose is.

5b. [1 mark]Milk contains lactose which some people can digest but some cannot.

State a function of lactose.

5c. [3 marks]Milk contains lactose which some people can digest but some cannot.

Explain the production of lactose-free milk.

6a. [2 marks]Outline the cell theory

6b. [2 marks]

Annotate the electron micrograph of the Escherichia coli cell with the function of the structures labelled I and II.

6c. [1 mark]Calculate the magnification of the electron micrograph.

7a. [2 marks]

The image shows a forest food web from North America.

Describe what is meant by a food chain.

7b. [1 mark]Identify a food chain with four or more organisms from the forest food web.

7c. [1 mark]Deduce the trophic level of each organism identified in your food chain from (b)(i).

7d. [1 mark]State one reason that the population of mountain lions is smaller than the populations of other animals in the food web.

8a. [1 mark]Define pathogen.

8b. [3 marks]Explain antibody production.

8c. [2 marks]Explain why antibiotics are effective against bacterial diseases but not against viral diseases.

9a. [1 mark]Define linked genes.

9b. [3 marks]In cats, the allele for curled ears (C) is dominant over the allele for normal ears (c). The allele for black colour (B) is dominant over

the allele for grey colour (b). A cross occurs between two cats that are both heterozygous for these unlinked traits.

Using a Punnett grid, predict the ratio of phenotypes of offspring in the next generation.

10a. [2 marks]Outline the symptoms of type II diabetes.

10b. [3 marks]Explain the dietary advice that should be given to a patient who has developed type II diabetes.

11a. [2 marks]

Describe the pattern of CO uptake in the control plants.2

11b. [2 marks]Outline the effect of increased carbon dioxide concentration on CO uptake.2

11c. [3 marks]Discuss how CO uptake in this investigation may be affected by other limiting factors.2

12a. [3 marks]The diagram shows some of the structures in an animal cell.

ib biology i summer packet 2017 - sphs advanced...

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