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Did you know?

The first monoclonal antibodies were made exclusively from mouse cells. Some are now fully human, which means they are likely to be safer and may be more effective than older monoclonal antibodies.

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The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.

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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.

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Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.

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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.

The Lion Gate of Mycenae (detail)—two lionesses flank the central column, c. 1300 B The Lion Gate of Mycenae (detail)—two lionesses flank the central column, c. 1300 B
Modification of neural transmission in the central nervous system: (a) normal transmission; (b) ... Modification of neural transmission in the central nervous system: (a) normal transmission; (b) ...
Chi-Square Analysis of Mendel's Data Chi-Square Analysis of Mendel's Data
Data for a Hypothetical Paternity Test Using 13 CODIS Genes Data for a Hypothetical Paternity Test Using 13 CODIS Genes
Gamete genotype frequencies calculated from genetic linkage data Gamete genotype frequencies calculated from genetic linkage data
Linkage Data from 39 Families with Cystic Fibrosis Linkage Data from 39 Families with Cystic Fibrosis
Video: Hershey Chase Experiments

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