| Date | November 2020 | Marks available | 1 | Reference code | 20N.1.SL.TZ0.2 |
| Level | Standard level | Paper | Paper 1 | Time zone | TZ0 / no time zone |
| Command term | Question number | 2 | Adapted from | N/A |
Question
The electron micrograph shows a section through a cell.
[Source: Photo © E. Newcomb. Nucleus, glyoxisomes, chloroplasts, and mitochondria - magnification
at 13,900x - UWDC - UW-Madison Libraries (wisc.edu) (https://search.library.wisc.edu/digital/AE2SBIWRVTRR5T87).]
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.
Markscheme
C
Examiners report
Syllabus sections
- 22M.1.HL.TZ1.7: What is a universal characteristic of the genetic code? A. There are more than 64 different...
- 22M.1.SL.TZ2.4: Pasteur used swan-necked flasks and a nutrient broth to demonstrate that spontaneous...
- 18M.1.SL.TZ2.4: Pasteur carried out a series of experiments that provided strong evidence against a widely...
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21N.2.SL.TZ0.6a:
Describe the endosymbiotic theory.
- 18N.1.HL.TZ0.5: In a copy of Louis Pasteur’s famous experiment, broth was put into flasks as shown in the...
- 19M.2.SL.TZ2.6a: Describe briefly the endosymbiotic theory.
- 21N.1.SL.TZ0.4: How do both mitochondria and chloroplasts provide evidence for the endosymbiotic theory? A....
- 17M.1.SL.TZ2.27: The bacterium Neisseria gonorrhoeae causes infections related to the human reproductive...
- 17M.1.HL.TZ2.4: What is evidence for the endosymbiotic theory? A. RNA can catalyse metabolic reactions. B....
- 18N.1.SL.TZ0.5: Apparatus was set up as shown to collect data. The graph shows the results after 47...
- 22M.1.SL.TZ1.4: Which cell component arose first during the formation of the earliest cells? A....
- 17M.1.SL.TZ1.21: Cladograms can be created by comparing DNA or protein sequences. The cladogram on the left is...
- 21M.1.SL.TZ2.5: Which statement is evidence for the endosymbiotic theory? A. Chloroplasts contain 70S...
-
22M.1.SL.TZ1.5:
In the chimpanzee (Pan troglodytes), the haploid number of chromosomes is 24. How many sister chromatids are present in the G2 phase of a somatic cell, such as a cell in the bone marrow of the chimpanzee?
A. 12
B. 24
C. 48
D. 96
- 20N.2.SL.TZ0.2d: Apart from the ribosomes, explain the evidence for the endosymbiotic theory of the origin of...
-
17N.2.HL.TZ0.06a:
Cell biologists play an important role in research into disease, fertility, evolution and many other areas of science.
Describe the origin of eukaryotic cells according to the endosymbiotic theory.
- 17M.2.HL.TZ1.1f.ii: Suggest a reason for the greater expression of the gene for the urea transporter after an...
- 20N.1.HL.TZ0.9: The first iron ore deposits in rocks appeared about 1.8 billion years ago. What took place to...
- 17M.2.SL.TZ1.1c: Estimate how much smaller drilled oysters raised in seawater at a high CO2 concentration were...
-
17M.2.SL.TZ1.2a:
Pictured below are Louis Pasteur’s original drawings of swan-necked flasks.
Describe how Pasteur’s experiments provided convincing evidence to falsify the concept of spontaneous generation.
- 19M.2.HL.TZ1.3a: Compare and contrast the structure of a typical prokaryotic cell with that of a mitochondrion.
- 19M.2.HL.TZ1.3b: Explain how mitochondria could have been formed from free living prokaryotes.
- 19M.2.SL.TZ1.2b: Discuss the evidence for the theory that mitochondria may have evolved from free-living...
- 17M.1.SL.TZ2.4: What is evidence for the endosymbiotic theory? A. RNA can catalyse metabolic reactions. B....
- 19N.1.SL.TZ0.3: Which statement provides evidence for endosymbiosis? A. Early prokaryotes contributed to a...
-
17N.2.SL.TZ0.06a:
Describe the origin of eukaryotic cells according to the endosymbiotic theory.
