Which of the following events occur when E. coli is starved for tryptophan?

I.  The ribosome translates leader peptide completely

II. Transcription reads through attenuator into trp EDCBA

III. Tryptophanyl tRNA is not formed

IV. A stem loop structure involving regions 3 and 4 is formed at attenuator site

TLS Online TPP Program

#Question id: 361

#SCPH05 I Biotechnology

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: 5564

#SCPH28 | Zoology

At the moment of sperm penetration, human eggs ________.

TLS Online TPP Program

#Question id: 1050

#SCPH06 I Botany

Which does not refer to the shape of a virus?

TLS Online TPP Program

#Question id: 15487

#SCPH05 I Biotechnology

Strains utilized for glutamate overproducers such as Cornybacterium are natural

TLS Online TPP Program

#Question id: 671

#SCPH01 Biochemistry

Which was a major scientific accomplishment by Linus Pauling?