Genes & Cells

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cell and fertilized egg with mitochondria

BREAK DOWN  Like most cells, sperm contain energy-producing mitochondria (one organelle and its membrane (red circle) shown, left). Once a sperm fertilizes an egg, the sperm’s mitochondria break down inside that membrane (right).

a deer tick

TOUGH BITE Deer ticks are now spreading a new species of bacteria that causes Lyme disease.

girl with dog

UNCOOL DROOL  Studies of drug-resistant urinary tract infections in dogs and cats raise concerns that pets might contribute to the spread of drug-resistant microbes.

Genes & Cells

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