It has been argued that hydrogen-powered automobiles can solve our energy problems because we can get all of the hydrogen that we need from sea water. Which of the following comments about the energy needed to separate the hydrogen and oxygen in water is correct?
Yes. It is the same as the energy released when the hydrogen is burned, so we get no net gain of energy.
The chlorophyll in plants uses sunlight to
Yes. It also produces the hydrogen in an ionized form that can power other chemical reactions.
The original source of energy for life forms that live near a black smoker is
Yes. Bacteria using chemosynthesis are the base of this alternate food chain.
A DNA molecule consists of
Yes. Then a special enzyme can separate the amino acid pairs and unzip the DNA molecule into two single-sided ladders.
A pair of sugar phosphate chains connected by pairs of amino acids describes a molecule of
Yes. It is essentially a ladder that is twisted to form a double helix. The sugar phosphate chains are the sides of the ladder. The amino acid pairs are the rungs.
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