Persistence length,

minimum filament length at which random thermal fluctuations are likely to cause it to bend.

#Id: 7736

#XL - Q Biochemistry

The number of neutrons is equal to the difference between the mass number of the atom (M) and the atomic number (Z).

#Id: 7735

#XL - Q Biochemistry

The mass number of the atom (M) is equal to the sum of the number of protons and neutrons in the nucleus.

#Id: 7734

#XL - Q Biochemistry

The number of electrons in a neutral atom is equal to the number of protons.

#Id: 7733

#XL - Q Biochemistry

Atoms are made of the same three basic particles: protons, neutrons, and electrons.

#Id: 8132

#XL - Q Biochemistry

Lipids as pigments in plants and bird feathers.

Birds acquire the pigments that color their feathers red or yellow by eating plant materials that contain carotenoid pigments, such as canthaxanthin and zeaxanthin.

The differences in pigmentation between male and female birds are the result of differences in intestinal uptake and processing of carotenoids.

#Id: 8131

#XL - Q Biochemistry