Tetanus is caused by a toxin produced by

1. Clostridium botulinum
2. Clostridium tetani
3. Clostridium perfringens
4. Clostridium welchii
5. Clostridium dificil


2

Biology & Microbiology

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Which of the following processes is central to the initiation of transcription?

A) binding of sigma to the promoter region B) formation of a phosphodiester bond in the elongating RNA strand C) binding of DNA polymerase to the promoter region D) formation of a DNA primer

Biology & Microbiology

Which of the following statements best compares a pseudocoelom and a coelom?

A. A coelom is completely enclosed by mesoderm whereas a pseudocoelom has an outer covering of mesoderm and an inner one of endoderm. B. A pseudocoelom is completely enclosed by mesoderm whereas a coelom has an outer covering of mesoderm and an inner one of endoderm. C. The coelom is enclosed by ectoderm and the pseudocoelom is enclosed by endoderm. D. The pseudocoelom is enclosed by ectoderm and the coelom is enclosed by endoderm. E. The coelom is enclosed by ectoderm and the pseudocoelom is enclosed by mesoderm.

Biology & Microbiology

Which term describes an additional layer of skin that forms a sheath like covering over the glans of a penis?

A. urethra B. fourchette C. scrotum D. foreskin

Biology & Microbiology

In a dicot stem, the ________ is between the vascular cambium and the cork cambium

A) cork B) xylem C) phloem D) pith E) apical meristem

Biology & Microbiology