2018年5月IB生物SL真题下载-Paper1
1. What feature of both striated muscle and aseptate fungal hyphae is different from typical cell structure?
A. They have multiple nuclei within a structural unit.
B. They have a cell wall that is not made of cellulose.
C. They have plasmids.
D. They have an absence of cholesterol in the plasma membrane.
2. Common pesticides used by gardeners contain neonicotinoids.
What is the effect of a neonicotinoid pesticide on the transmission of a nerve impulse between neurons in an insect?
A. It prevents the release of acetylcholine from the presynaptic membrane.
B. It widens the synaptic cleft so diffusion of acetylcholine across the gap is slower.
C. It irreversibly binds with acetylcholine receptors on the postsynaptic membrane.
D. It interferes with the enzymatic breakdown of acetylcholine by acetylcholinesterase.
3. How does potassium move across the membrane of a neuron during repolarization?
A. Simple diffusion
B. Facilitated diffusion
C. Endocytosis
D. Active transport
4. Which organelle provides evidence that eukaryotic cells originated when large prokaryotes engulfed small free-living prokaryotes?
A. Chloroplast
B. Nucleoid
C. 80S ribosome
D. Vacuole
5. The concentrations of cyclins rise and fall in cells at certain times.
What times are these?
A. Day and night
B. Seasons of the year
C. Stages of mitosis and interphase
D. Developmental stages in the life cycle
6. What feature of carbon makes it most suitable as a basis for life?
A. Its abundance in nature
B. Its bonding properties
C. Its reactivity to light
D. Its presence in the early atmosphere of the Earth
7. Researchers have developed a skin patch which can detect and measure very small concentrations of ions, sugars, amino acids, proteins and hormones which remain when sweat evaporates. What allows the presence of these substances in sweat?
A. Cohesion
B. Hydrophobic interactions
C. Solvent properties
D. Thermal properties
8. Which type(s) of fatty acid in the diet is/are positively correlated with an increased risk of coronary heart disease?
- I. Saturated
- II. Trans unsaturated
- III. Cis unsaturated
A. I only
B. I and II only
C. II only
D. II and III only
9. Which protein has the highest tensile strength (ability to resist breaking when stretched)?
A. Cellulose
B. Actin
C. Spider silk
D. Albumin
10. What is the advantage of using lactase in an immobilized state in the food manufacturing industry?
A. It functions within cells.
B. It dissolves in multiple solvents.
C. It converts cellulose into glucose.
D. It is less likely to become denatured.
2018年5月IB生物SL真题余下省略！
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