Which is not a portal of entry?

a. Gastrointestinal tract
b. Urogenital tract
c. Respiratory system
d. Circulatory system
e. Skin


d. Circulatory system

Biology & Microbiology

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During which of the following steps of the TCA cycle does substrate-level phosphorylation take place?

A) TCA-2 B) TCA-3 C) TCA-4 D) TCA-5 E) TCA-6

Biology & Microbiology

The prokaryotic DNA is located in the  

A.  capsid region. B.  nucleoid region. C.  endospore region. D.  peptidoglycan region. E.  pili region.

Biology & Microbiology

If a restriction endonuclease cuts a circular DNA three times, how many fragments should there be after the DNA is

subjected to electrophoresis through an agarose gel?

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

Biology & Microbiology

One goal of pedigree analysis is to determine ____

a. what diseases a family will display b. if two people are related c. gene loci d. whether a gene has a dominant or recessive pattern of inheritance e. what treatment a person should undergo

Biology & Microbiology