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BIO1011 - Blueprints for Life - Clayton S1 2025

BIO1011 - Blueprints for Life - Clayton S1 2025

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Some bacteria carry out a type of photosynthesis that uses H₂S in place of H₂O. Assuming that the process is otherwise similar to green plant photosynthesis, which of the following could represent the overall reaction?

6CO₂ + 12H₂S > C₆H₁₂S₆ + 6H₂S + 6O₂

6CO₂ + 12H₂S > C₆H₁₂O₆ + 6H₂S + 6O₂

6CO₂ + 12H₂S > C₆H₁₂O₆ + 6H₂O + 12S

50%

6CO₂ + 12H₂S > C₆H₁₂S₆ + 6H₂0 + 6SO₂

50%

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In aquatic ecosystems, which statement is INCORRECT?

Shorter wavelengths of visible light penetrates water to the greatest depths.

Different wavelengths of visible light penetrate water to different depths.

Blue light penetrates water to the greatest depths.

Longer wavelengths of visible light penetrates water to the greatest depths.

100%

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Photosynthetic bacteria evolved about 2.8 billion years ago in our planet’s oceans. Their evolution, and the oxygen they produced, had a profound effect on the chemistry of the ocean, which related to an overall change in colour. What was the colour change?

Red to blue

Green to red

50%

Blue to red

50%

Red to green

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Macroalgae are typically labelled into three categories - red, brown or green algae. Where do these colour ‘labels’ typically come from?

It is due to the types of pigments embedded in their cell wall.

It is due to the types of pigments in their chloroplasts.

100%

It is dues to the types of pigments embedded in their cell membrane.