2017年5月IB生物SL真题下载-Paper1
1. Which structure found in eukaryotes has a single membrane?
A. Nucleus
B. Lysosome
C. Chloroplast
D. Mitochondrion
2. The following electron micrograph shows part of a palisade mesophyll cell. Which of the labelled structures controls the exchange of substances to and from the cell?
3. Which organism has DNA located in three organelles?
A. A sponge
B. A fern
C. A flatworm
D. A bacterium
4. Which organelle is involved in generating vesicles destined for the cell membrane?
A. Golgi apparatus
B. Smooth endoplasmic reticulum
C. Rough endoplasmic reticulum
D. Lysosome
5. When during the cell cycle does DNA replication take place?
6. A polymer of alpha-D-glucose found in plants has mostly 1,4 linkages and some 1,6 linkages.Which molecule fits this description?
A. Glycogen
B. Cellulose
C. Amylose
D. Amylopectin
7. In an experiment the effect of changing pH on an enzymatic reaction is tested. Which could be a dependent variable in this kind of experiment?
A. Changing substrate concentration
B. Rate of formation of product
C. Variation in temperature
D. Change in pH
8. Meselson and Stahl conducted experiments using the isotopes 14N and 15N which showed that DNA replication is semi-conservative. What would they have observed about the distribution of isotopes in the DNA after one round of replication if DNA replication was conservative rather than semi-conservative?
A. Only 14N DNA
B. Only 15N DNA
C. All DNA half 14N and half 15N
D. Half the DNA with only 14N and half with only 15N
9. The most abundant structural protein in the human body is found in ligaments and skin. What is the name of this protein?
A. Collagen
B. Hemoglobin
C. Myoglobin
D. Immunoglobulin
10. The graph shows the effect of increasing the substrate concentration on the rate of an enzyme-catalysed reaction. What is occurring during the phase indicated by section Y of the graph?
A. The active site of the enzyme is saturated.
B. The enzyme becomes denatured.
C. The substrate concentration has risen too high.
D. The optimum rate is reached.
2017年5月IB生物SL真题余下省略！
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