Pathogenicity islands are
A. enzymes like proteases and hemolysins that promote pathogenesis.
B. gene clusters that confer the ability to become pathogenic.
C. a lymphoid tissue present in the small intestine.
D. closely related groups of pathogenic enteric organisms.
Answer: B
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The chemical group box 1 in the accompanying figure is a:
a. pyrimidine. b. purine. c. phosphate. d. amino acid. e. covalent bond
Fragile X syndrome:a
results in learning, attention, and hyperactivity disabilities in males. b. is not inherited from the parents. c. is characterized by a fragile site at the tip of the Y chromosome. d. results from a deletion of CGG sequences in the fragile X gene. e. is due to genomic imprinting..
Which organelle is NOT a part of the endomembrane system?
a. the endoplasmic reticulum b. the lysosome c. the nucleolus d. the Golgi complex
The chromosomal aberration that causes cri-du-chat syndrome can be referred to as a(n) ________
A) duplication B) reciprocal translocation C) inversion D) simple translocation E) segmental deletion