Type II CRISPR-Cas systems are the most widely used systems because ________
A) Streptococcus pyogenes is an important research organism
B) they were discovered first
C) they use a nuclease complex
D) they only require a single protein, Cas9
Answer: D
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What will be an ideal response?
Four of the five choices listed below contain DNA
Select the exception. a. Thermus aquaticus b. nanobes c. glaucophytes d. lipid spheres e. cyanobacteria
A 1-year-old boy is evaluated for a suspected immune deficiency. He has a history since birth of eczema, recurrent rashes, and diarrhea. His white blood cell count (WBC) count is 6.75/uL (normal values: 5.0-10.8 x 103 uL) with a normal differential. Platelet count is 35,000 (normal values: 150,000- 350,000/uL), and the platelets are small. His IgG is 750 mg/dL (normal values: 600-1,500 mg/dL). IgM is 30 mg/dL (normal values; 75-150 mg/dL). IgA is 475 mg/dL (normal values: 50-125 mg/dL). IgE is 750 mg/dL (10-50 mg/dL). The boy's blood is typed as O-positive, and he does not have anti-A or anti-B antibodies. Flow cytometry performed on his blood shows 11% CD19 (normal values: 5%-20%) and 50% CD3 cells (normal values: 60%-80%) with a normal ratio of CD4:CD8. T-cell function tests are
abnormal. This boy most likely has: A. Bruton's tyrosine kinase deficiency. B. Wiskott-Aldrich syndrome. C. DiGeorge anomaly. D. ataxia telangiectasia.
Most drugs that inhibit the synthesis of the cell wall act by
A) preventing the cross-linkage of NAM subunits. B) blocking the secretion of cell wall molecules from the cytoplasm. C) preventing the formation of alanine-alanine bridges. D) disrupting the formation of the mycolic acid layer of the cell wall. E) preventing the formation of ?-lactamases.