2020年11月IB生物SL真题下载-Paper3
The electron micrograph shows a section through a cell and refers to questions 1 and 2.
1. What is the name of the cell component labelled Y?
A. Golgi apparatus
B. Nucleus
C. Cytoplasm
D. Vacuole
2. Which feature of the cell in the micrograph is consistent with the endosymbiotic theory?
A. X has a single membrane.
B. Y has a double membrane.
C. X contains 70S ribosomes.
D. Y contains 80S ribosomes.
3. Which sequence has the cells arranged according to their ability to differentiate, starting from the least able?
A. bone marrow, neuron, embryonic, umbilical
B. neuron, bone marrow, umbilical, embryonic
C. umbilical, embryonic, bone marrow, neuron
D. embryonic, umbilical, bone marrow, neuron
4. The diagram shows a section through a membrane. What are the modes of transport in the diagram?
5. How many chromosomes are there in a cell during anaphase of mitosis, if the diploid number of the cell is 20?
A. 10
B. 20
C. 40
D. 80
6. What are the type of reaction and the product(s) shown in this reaction?
7. The chart shows ranges of body mass index (BMI) for children and teenagers.
A 9-year-old boy has a height of 120 cm and weighs 28.8 kg. What weight category is he in according to his BMI?
A. Underweight
B. Healthy
C. Overweight
D. Obese
8. The genetic code is shown.
In a coding gene, the DNA triplet in the transcribed strand is changed from AGG to TCG.What would be the result of this change in the genome?
A. A non-functional protein
B. A different but functional protein
C. No change in the protein
D. Termination of the polypeptide
9. The diagram represents transcription and translation.
10. What is the reason for Taq DNA polymerase being used in the polymerase chain reaction (PCR)?
A. It does not denature at high temperatures.
B. It produces Okazaki fragments more rapidly.
C. It allows translation to proceed rapidly.
D. It works efficiently with helicase in PCR.
2020年11月IB生物SL真题余下省略！
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