Which of the following is a permanent post-translational covalent modification?

A. attachment of a sugar
B. disulfide bond formation
C. proteolytic processing
D. attachment of a lipid
E. All of the choices are correct.


A. attachment of a sugar

Biology & Microbiology

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Streptococcus pyogenes produces proteins called ________, which alter(s) the surface of the pathogen and inhibits phagocytosis

A) glycolipids B) leukocidins C) M proteins D) pus

Biology & Microbiology

Choose the answer that correctly completes the statement:

In deoxyribonucleotides, the pyrimidines are bound to the 1' carbon of pentose sugar by a ____________¬¬_ to _____________of the base. A. glycosidic bond; N-1 B. glycosidic bond; N-9 C. hydrogen bond; N-1 D. phosphodiester bond; N-3 E. glycosidic bond; N-3

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The sequence of a promoter constitutes the most basic mechanism of transcription regulation because:

A. promoters are always bound by activators. B. RNA polymerase has differential affinities for different sequences that correlate with the efficiency of transcription. C. promoters are always bound by repressors. D. the expression levels of different housekeeping genes are always identical.

Biology & Microbiology

Which of the following is not made from long chains of glucose?

A) Starch B) Monosaccharides C) Glycogen D) Cellulose

Biology & Microbiology