2017年11月IB生物SL真题下载-Paper1
The image of a Paramecium refers to question 1 and question 2.
1. Which function is accomplished by structures X and Y in the Paramecium?
2. What evidence from the image of Paramecium indicates whether the organism is a prokaryote or a eukaryote?
A. Compartments in the cell indicate that it is a eukaryote.
B. No nucleus indicates that the cell is a prokaryote.
C. Lack of a cell wall indicates that the cell is a eukaryote.
D. It is a unicellular organism, so it must be a prokaryote.
3. The salt concentration inside an animal cell is 1.8 %. The salt concentration in the surrounding medium becomes 5 %. What will be the likely response?
A. The cell will gain water from the medium.
B. The cell will lose salt to the medium.
C. The cell will remain unchanged.
D. The cell will shrink from loss of water.
The diagram of a membrane refers to question 4 and question 5.
4. In the diagram, which structure is an intrinsic or integral protein?
5. In the diagram, which part of the membrane structure does the molecule below form?
6. Which molecule could be hydrolysed into amino acids?
7. Which property of water accounts for its moderating effects on the Earth’s atmosphere?
A. Cohesive
B. Thermal
C. Transparency
D. Adhesive
8. The Framingham heart study was an observational study that went on for 20 years. The following data were produced.
Which conclusion can be drawn, based on these data?
A. It is better to eat margarine than to eat butter.
B. The more margarine consumed, the greater the incidence of coronary heart disease.
C. Butter is a natural product whereas margarine is hydrogenated vegetable oil that leads to coronary heart disease.
D. Margarine causes more heart related deaths than butter.
9. Three flasks were prepared for an analysis of the activity of amylase. At time zero, each of the substances indicated in the diagrams was added.
Which flask(s) could provide support for the hypothesis that heat denatures enzymes?
A. Flasks I and II after 15 minutes
B. Flasks II and III after 15 minutes
C. Flasks I and III after 15 minutes
D. Flask III at time zero and again after 15 minutes
10. For which discovery about DNA do Watson and Crick receive credit?
A. DNA is the molecule that genes are made of.
B. The amount of adenine equals the amount of thymine in an organism.
C. Phosphate–pentose bonding along the nucleotide backbone is covalent.
D. The shape of DNA is a double helix.
2017年11月IB生物SL真题余下省略！
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