F⁺ Present as separate circular plasmid

F⁻ Absent

Hfr Present, integrated into bacterial chromosome

F′ Present as separate circular plasmid, carrying some bacterial genes

TLS Online TPP Program

#Id: 3042

#Unit 3. Fundamental Processes

FENl is an exo-jendonuclease that recognizes the structure created when one strand of DNA is displaced from a duplex as a "flap." In mammalian replication it cleaves at the base of the flap to remove the RNA primer.

TLS Online TPP Program

#Id: 2028

#Unit 8. Inheritance Biology

F (fertility) factor Episome of E. coli that controls conjugation and gene exchange between cells.

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#Id: 7758

#Unit 1. Molecules and their Interaction Relevant to Biology

A molecule is the smallest part of a substance that has the physical and chemical properties of that substance. In some respects, a molecule is similar to an atom. A molecule, however, is composed of more than one atom.

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#Id: 4784

#Unit 5. Developmental Biology

In an unperturbed embryo, both ABa and ABp contact the EMS blastomere, but only ABp contacts the P2 cell.

TLS Online TPP Program

#Id: 2809

#Unit 13. Methods in Biology

In RPLC the stationary phase is non-polar and the mobile phase relatively polar, hence the name reversed-phase