2018年11月IB生物SL真题下载-Paper1
1. If cells of a multicellular organism have the same genes, how can there be many different cell types in a body?
A. Some genes but not others are expressed in each cell type.
B. Cells lose some genes as development occurs.
C. Genes do not determine the structure of a cell.
D. Cells must practice division of labour in order to survive.
2. The electron micrograph shows part of a cell. Which organelle is the site of aerobic respiration?
3. The images are microscopic views of two similar cells.
What is a reason for the differences between the two micrographs?
A. The lower image has a higher magnification.
B. The lower image has greater resolution.
C. A nucleus can only be seen in the upper image.
D. The upper image is an electron micrograph.
4. What part of the plasma membrane is fluid, allowing the movement of proteins in accordance with the fluid mosaic model?
5. Apparatus was set up as shown to collect data.
What causes the rates to differ?
- I. Different concentration gradients at the start
- II. Diffusion of sugar is initially greater in Y than in X
- III. The systems are reaching equilibrium over time
A. I only
B. II only
C. I and III only
D. II and III only
6. How does mitosis produce two genetically identical nuclei?
A. By separation of homologous chromosomes
B. By separation of sister chromatids
C. By division of the cytoplasm into two equal cells
D. By division of the nuclear membrane into two equal parts
7. Which type of chemical reaction is an example of anabolism?
A. Photolysis
B. Combustion
C. Hydrolysis
D. Condensation
8. Where are amino acids joined together to make polypeptides?
A. Nucleus
B. Nucleolus
C. Golgi apparatus
D. Ribosomes
9. The table shows some codons for five amino acids.
Which of these DNA strands will code for the amino acid sequence glycine-serine-glycine?
A. CCUUCGCCG
B. CCTTCGCCG
C. GGAAGCGGA
D. CCUUCGCCU
10. Living organisms control pH within their tissues. What is a reason for regulating pH?
A. All parts of a body must be kept at the same pH to survive.
B. Many reactions can only happen at specific pH levels.
C. pH affects osmosis.
D. Control of active transport is achieved by pH.
2018年11月IB生物SL真题余下省略！
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