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.

TLS Online TPP Program

#Id: 7955

#XL - Q Biochemistry

Only asparagine residues in the tripeptide sequences Asn-X-Ser and Asn-X-Thr (where X is any amino acid except proline) are substrates for oligosaccharyl transferase.

TLS Online TPP Program

#Id: 9399

#XL - T Zoology

Imprinting

Imprinting, in psychobiology, a form of learning in which a very young animal fixes its attention on the first object with which it has visual,  auditory, or tactile experience and there after follows that object

TLS Online TPP Program

#Id: 7846

#XL - T Zoology

When the anomeric hydroxyl of a D-hexose is on the same side of the ring as C-6, the structure is β a by definition; when it is on the opposite side from C-6, the structure is α.

TLS Online TPP Program

#Id: 8604

#XL - R Botany

G1/S Cyclin–CDKs

In human - cyclin E-CDK 2 

In budding yeast - CIn 1/2-Cdc 28

TLS Online TPP Program

#Id: 2207

#XL - T Zoology

James Hutton and Charles Lyell- Uniformitarianism