Practice Questions

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#Question id: 5281

In the mating Hfr Strs met+ his+ leu+ trp+ Ala+ X F- Strres met- his- leu- trp- Ala-. At regular interval time, the mating cells are interrupted and the cell suspensions plated on four different growth media with streptomycin. The amino acids in the growth media and the number of colonies observed on each are as follows:

Interrupted time

Composition of media

Growth

His

Leu

Ala

Trp

Met

2 min

+

-

+

+

+

Yes

10 min

+

-

-

+

+

Yes

12 min

+

-

-

+

-

No

15 min

+

-

-

-

+

Yes

20 min

-

-

-

-

+

Yes

What is the order of transfer of the genes?

#XL - S Microbiology

Leu- Ala- His- Met - Trp
Leu- Trp- His- Met-Ala
Ala- Trp- His- Met- Leu
Leu- Ala- Trp- His- Met

More Questions

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#Question id: 5763

#XL - R Botany

A mutation that causes a mutant phenotype only under restrictive conditions

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#Question id: 1115

#XL - Q Biochemistry

Which of the following is true during a typical cAMP-mediated signal transduction event?

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#Question id: 8930

#XL - T Zoology

Soon after the coelom begins to form, a researcher injects a dye into the coelom of a deuterostome embryo. Initially, the dye should be able to flow directly into the

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#Question id: 8944

#XL - R Botany

Which two groups are most clearly represented in the Ediacaran fauna?

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#Question id: 361

#XL - S Microbiology

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.