The labels for ten bacterial strains were mixed up and now you do not know the identity of each strain. you know all strains are auxotrophs and each one has a single, unique mutation. you set up pairwise crosses between bacterial strains and select for exconjugants by plating on mm. use the information below to determine f-, f+, and hfr strains. (- means no colonies grow on mm after conjugation, + means few colonies, +++ means many colonies) explain why f- strains: a1, a2, b5 f+ strains: a3, a4, b3, b4 and hfr strains: b1, b2, a5 b1b2b3b4b5 a1- a2- + + +++ f- strains: f+ strains: hfr strains:

As auxotrophs are mutants organism which requires particular additional nutrients which normal strains can not,

Hfr A high-frequency recombination cell (Hfr cell) (also called an Hfr strain) is a bacterium with a conjugative plasmid (for example, the F-factor) integrated into its chromosomal DNA

F+have fertity factor and are considered to be inheritable( male) while female have non and do not make pill for conjugation

**The qn is incomplete

water is a polar molecule. a chemical bond is a force of attraction between atoms or ions. bonds form when atoms share or transfer valence electrons. atoms form chemical bonds to achieve a full outer energy level, which is the most stable arrangement of electrons. so, false

explanation:

in h2o molecule, two water molecules are bonded by a hydrogen bond but the bond between two h - o bonds within a water molecule are covalent. the greater the electronegativity difference, the more ionic the bond is. bonds that are partly ionic are called polar covalent bonds. nonpolar covalent bonds, with equal sharing of the bond electrons, arise when the electronegativities of the two atoms are equal.

the growth of the plants is affected by the heat of the light. what is the student doing?