教育学习   常速英语

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Lets take a closer look at a chloroplast, the organelle where photosynthesis takes place. Photosynthesis consists of two sets of chemical reactions: the light reactions and the Calvin cyc...

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We are going to zoom in on a cross section of a leaf to have a closer look at the center of action for photosynthesis. A leaf has many different types of cells, such as mesophyll cells,...

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Photosynthesis is a set of chemical reactions in which light energy is converted to chemical energy. Light energy enables the movement of electrons from molecules that donate electrons ...

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[SCRIBBLING] SPEAKER: Almost all life on Earth is solar powered.$#10320#$10320#$ Plants, algae, and some bacteria capture light energy from the sun and convert it to chemical energy in ...

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GREG CARR: I flew over Gorongosa. I'm looking down, and it's magnificent. There's a great lake in the center of the ecosystem. There's rivers. There's a mountain with a rainforest. ...

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ALVARADO: Imagine that somebody came and told you that there were animals whose heads could be decapitated, and that, in the span of a short period of time, these heads would begin to grow again from ...

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[Jennifer Doudna:] Science is a serendipitous endeavor. We're exploring nature and trying our best to get at the truth. And every now and then, we're surprised. [Ethan Bier:] When I first hear...

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[NARRATOR:] A patient with cystic fibrosis is susceptible to infections of the lungs. This is due to a mutation that affects a protein on the surface of lung cells. Many different mutations ca...