Malaria is caused by a one-celled parasite called a Plasmodium.

疟疾是由称为疟原虫的一种单细胞寄生虫造成的。

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For example, one-celled animals always live in water, which helps the cell hold its shape.

比如，单细胞动物总是生活在水中，因为水有助于保持它的形态。

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The one-celled animals react to food by moving toward it and react to danger by moving away.

单细胞动物对食物的反应是向食物移动，离开是对危险的反应。

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At the time, Venter was trying to accelerate the process of sequencing whole genomes, first one-celled organisms, but ultimately gearing up to take on the decoding of the human genome.

FORBES: Venter and the Vatican

The last time I checked with biologists, philosophers and even politicians on both sides of the debates about abortion, stem cell research and cloning, they were pretty certain human individuals were defined by two sets of chromosomes (half from the male, half from the female) which were arranged in the one-celled zygote after fertilization.

FORBES: Biologist Asserts Your Life Began...Before Fertilization.

The most obvious difference between a yeast and a nematode is that one is single-celled while the other is multi-cellular.

ECONOMIST: The first complete DNA sequence of an animal is now in the bag