2630991
Descrição
Quiz por Becca Shaw, atualizado more than 1 year ago
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Criado por Becca Shaw
aproximadamente 9 anos atrás
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Questão 1
Questão
Rapid overgrowth of cyanobacteria may occur due to
Responda
-
Increased nutrient content
-
Lower pH
-
Higher temperatures
-
A reduction in competition and predation
Questão 2
Questão
Nutrient exhaustion is associated with rapid death and decline, forming scum
Responda
- True
- False
Questão 3
Questão
The existence of cyanobacterial blooms are not related to climate change
Responda
- True
- False
Questão 4
Questão
What are the long-term consequences of cyanobacterial overgrowth?
Responda
-
Increase in climate
-
Food web disruption
-
Decrease in biodiversity
-
Economic losses
Questão 5
Questão
What of the following nutrients are associated with cyanobacterial blooms?
Responda
-
Magnesium
-
Iron
-
Phosphate
-
Carbon
Questão 6
Questão
Which eukaryotic species overgrowth causes 'red tide'?
Responda
-
Microcystis aeruginosa
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Karena brevis
-
Trichodesmium
-
Prochlorococcus marinus
Questão 7
Questão
How may a Harmful Algal Bloom cause indirect toxicity to organisms?
Responda
-
Generating a hypoxic or anoxic environment
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Producing waste products
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Increasing competition for resources
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Releasing toxins
Questão 8
Questão
Microcystis aeruginosa and Trichodesmium are both eukaryotic organisms
Responda
- True
- False
Questão 9
Questão
People boating on high risk lakes reported symptoms of toxicity how much more/less frequently than others? (Approximately)
Responda
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Three times as much
-
Twice as much
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Half as much
-
No difference
Questão 10
Questão
Microcystis aeruginosa is a gram-negative species of bacteria
Responda
- True
- False
Questão 11
Questão
Microcystins enhance fluid uptake in fish causing increased toxicity which can lead to liver damage or cancer
Responda
- True
- False
Questão 12
Questão
What are the effects caused by a bloom of Microcystis aeruginosa?
Responda
-
Nutrient content of water is increased
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Selective predation occurs whereby the food web is disrupted
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Water quality is decreased
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Economic losses due to lack of fishing and tourism
Questão 13
Questão
Microcystis aeruginosa is made up of spherical cells, a flagellum and a gram-negative wall structure
Responda
- True
- False
Questão 14
Questão
What size is the genome of Microcystis aeruginosa? (Approximately)
Responda
-
6 Mb
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4 Mb
-
5 Mb
-
2 Mb
Questão 15
Questão
Which of the following statements are true regarding gas vesicles in Microcystis aeruginosa?
Responda
-
They are produced during the night to bring the cell to the surface of the water
-
They are arranged in a pentagonal array
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They reduce the surface area: cytoplasm ratio
-
They provide buoyancy for access to light
Questão 16
Questão
What are the names of the gas vesicle structural proteins?
Responda
-
GpB2, GpB3 and F270
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SI3P and NNt3
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P2f and Fn73
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GvpA and GvpC
Questão 17
Questão
A cork and hammer experiment was conducted to mimic the effect of vesicle disruption due to sudden pressure change
Responda
- True
- False
Questão 18
Questão
Which of the following statements are true concerning algicides?
Responda
-
Their use is not feasible on a large scale
-
Algicide use is ineffective at destroying cyanobacterial blooms
-
Bacterial toxins may be released when the cells are destroyed during algicide treatment
-
None of the above are true
Questão 19
Questão
Sonication or hydrostatic pressure may be used as control measures for treating algal blooms as this has an effect on the buoyancy of gas vesicles
Responda
- True
- False
Questão 20
Questão
Which of the following are appropriate control measures in regards to cyanobacterial blooms?
Responda
-
Increase mixing/flushing
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Use of micropredators
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Limit temperatures
-
Use of algicides
Questão 21
Questão
Which of the following statements about Microcystin-LR is false?
Responda
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Peptide synthesis is non-ribosomal
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Preferential uptake by liver transporter OATP
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Released on lysis of cells
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Cyclic hexapeptide
Questão 22
Questão
How does microcystin-LR cause liver damage?
Responda
-
Inhibits protein PP2A
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Causes damage due to reactive oxygen species and apoptosis
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Inhibits protein phosphatase-1
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Is transported by protein OAFP
Questão 23
Questão
During the day, what genes are transcribed by MIcrocystis aeruginosa?
Responda
-
Energy metabolism
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Photosynthesis
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DNA repair
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DNA replication
Questão 24
Questão
During the night, what genes are transcribed by Microcystis aeruginosa?
Responda
-
Photosynthesis
-
Energy metabolism
-
DNA replication
-
DNA repair
Questão 25
Questão
Eutrophicaton due to hippo waste occurred in Kruger National Park, causing many unexpected animal deaths
Responda
- True
- False
Questão 26
Questão
The addition of chlorine to treat water in Brazil meant less people were affected by the HAB toxins
Responda
- True
- False
Questão 27
Questão
Microcystin-LR was produced by Microcystis bloom in Tabocas reservoir causing contaminated water to be distributed in Brazil
Responda
- True
- False
Questão 28
Questão
What serious health outcomes are associated with long-term exposure to cyanobacterial blooms?
Responda
-
Alzheimer's disease
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Liver cancer
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Emphysema
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Parkinson's disease
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