Severe combined immune deficiencies (SCID) affect both

A) humoral and cellular immunity.

B) white blood cells and red blood cells.

C) mast cells and macrophages.

D) helper B cells and cytotoxic B cells.


A) humoral and cellular immunity.

Biology & Microbiology

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

A. phosphorylation B. acetylation C. disulfide bond formation D. phosphorylation and acetylation E. acetylation and disulfide bond formation

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The Danish physician Hans Christian Gram

A. developed the Gram-stain technique B. devised the metric system of weights (milligrams, grams, kilograms) C. developed the procedures for determining whether a particular organism causes a specific disease D. developed both the Gram stain and the method of determining whether a particular organism causes a specific disease E. none of the other options presented

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Which number identifies the sequence most directly impacted by chromatin remodeling?

a. 1 b. 2 c. 3 d. 4 e. 5

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