Chancroid is the sexually transmitted disease caused by:
a. H. influenzae.
b. Haemophilus ducreyi.
c. H. aphrophilus.
d. Haemophilus parainfluenzae.
B
Chancroid is the sexually transmitted disease caused by H. ducreyi. Although small outbreaks of this disease have occurred in the United States, this disease is more commonly recognized among socioeconomically disadvantaged populations that inhabit tropical environments.
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The incorporation of a single strand of donor DNA into a recipient DNA duplex so that the donor strand replaces one of the strands or the recipient duplex generates ________ DNA.
A. unstable B. heteroduplex C. aberrant D. heterogeneous
Place the following steps for cloning DNA in the correct order:1 - use vector to deliver new rDNA to bacterial or other cells2 - use restriction enzymes to cut a plasmid and add the desired gene3 - isolate and cut out a desired gene using restriction enzymes4 - use DNA ligase to seal the new gene5 - allow bacterial cells to replicate and produce desired product
A. 3, 2, 4, 1, 5 B. 5, 3, 2, 4, 1 C. 1, 2, 3, 4, 5 D. 2, 5, 3, 1, 4
A diet low in fiber can lead to ____
a. GERD b. hepatitis c. diarrhea d. Crohn’s disease e. diverticulitis
Although viruses are extremely small, they are too large to enter a cell by passive transport. Which process brings viruses into a host cell?
A) diffusion B) osmosis C) exocytosis D) endocytosis