Benzo(a)pyrene, found in cigarette smoke as well as in coal tar, undergoes metabolic activation by cytochrome P-450 in the lungs to form a potent mutagen.

TLS Online TPP Program

#Id: 2896

#Unit 13. Methods in Biology

The more massive a biological particle is, the faster it moves in a centrifugal field.

TLS Online TPP Program

#Id: 521

#Unit 2. Cellular Organization

Yeast genes are short, but genes in flies and mammals have a dispersed bimodal distribution extending to very long sizes.

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#Id: 7602

#Unit 5. Developmental Biology

In 2nd pathway, sperm with intact acrosomes become bound to ZP3, which causes the acrosome reaction, and the sperm binding is then transferred to ZP2

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#Id: 4316

#Unit 11. Evolution and Behavior

Theories to explain origin of life

Special Creation

Panspermia/ Cosmozoic theory/ Interplanetary theory

Spontaneous Generation

TLS Online TPP Program

#Id: 6361

#Unit 2. Cellular Organization

Repressors bind to specific sites on the DNA. In bacterial cells, such binding sites, called operators

Regulation by means of a repressor protein that blocks transcription is referred to as negative regulation. Activators provide a molecular counterpoint to repressors; they bind to DNA and enhance the activity of RNA polymerase at a promoter; this is positive regulation.Repressor binding to DNA is regulated by a molecular signal called effector