P-450 enzymes, modify benzo(a)pyrene in a series of reactions, producing 7,8-diol-9,10-epoxide, a highly potent mutagenic species.

TLS Online TPP Program

#Id: 2810

#Unit 13. Methods in Biology

In RPLC stationary phase most commonly used is in the bonded-phase form, in which alkylsilane groups are chemically attached to silica. Butyl (C4), octyl (C8) and octadecyl (C18) silane groups are most commonly used.

TLS Online TPP Program

#Id: 4044

#Unit 2. Cellular Organization

In G-banding, chromosomes are first gently heated and then exposed to Giemsa stain; this DNA dye preferentially darkens certain regions to produce alternating dark and light G bands. Each G band is a very large segment of DNA from 1 to 10 Mb in length, containing many loops. With high-resolution G-banding techniques, a standard diploid human karyotype of 46 chromosomes is seen to contain hundreds of dark and light G bands. Not used in plants.

TLS Online TPP Program

#Id: 4483

#Unit 13. Methods in Biology

Darkfield microscopy is used for very thin spirochetes, such as Treponema pallidum, the causative agent of syphilis.

TLS Online TPP Program

#Id: 109

#Unit 5. Developmental Biology

Cells can progress from totipotent to pluripotent to determined.   

TLS Online TPP Program

#Id: 9441

#Unit 11. Evolution and Behavior

Promiscuous

In promiscuous mating systems, each male or female may mate with multiple partners.

Chimpanzees, bonobos and Intertidal and terrestrial mollusks