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TLS Online TPP Program

#Question id: 15616

The diagram below shows the F factor and a portion of the E. coli chromosome that has three different insertion sequences (IS) of the same type as is carried on F.
                     
Describe the three different Hfrs (Hfr #1, Hfr #2 and Hfr #3) that can be formed by recombination between the IS on F and each of the IS sequences on the chromosome. Some including the positions of each of the markers (A, B, C, and D) and state which of these markers would be transferred early?

#SCPH01 Biochemistry

  1. Hfr #1: A transferred early

    Hfr #2: C (and then D) transferred early

    Hfr #3: C (then B then A) transferred early

  2. Hfr #1: A transferred early

    Hfr #2: D transferred early

    Hfr #3: B transferred early

  3. Hfr #1: B transferred early

    Hfr #2: C transferred early

    Hfr #3: B (and then A) transferred early

  4. Hfr #1: A transferred early
    Hfr #2: D (and then C) transferred early
    Hfr #3: B ( and then A) transferred early

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TLS Online TPP Program

#Question id: 430

#SCPH01 Biochemistry

The reactions that digest foods in the mouth, stomach and intestine are classified as reactions.
TLS Online TPP Program

#Question id: 361

#I Life Science/ Life Sciences Group – I-V

Calculate the percentage of histidine that has its imidazole side chain protonated at pH 7.3. The pKa values for histidine are pK1 = 1.8, pK2 (imidazole) = 6.0, and pK3 = 9.2.
TLS Online TPP Program

#Question id: 14301

#SCPH05 I Biotechnology

Pseudomonas sp. has a mass doubling time of 2.4 h when grown on acetate. The saturation constant using this substrate is 1.3 g/l (which is unusually high), and cell yield on acetate is 0.46 g cell/g acetate. If we operate a chemostat on a feed stream containing 38 g/l acetate, find the Cell concentration when the dilution rate is one-half of the maximum?

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TLS Online TPP Program

#Question id: 11954

#SCPH28 | Zoology

Folic acid supplements have become especially important for pregnant women because ________.
TLS Online TPP Program

#Question id: 2944

#SCPH05 I Biotechnology

DNA replication at each origin occurs only once during the cell cycle because of: