Pertussis (whooping cough), an epidemic disease, is a highly contagious, acute infection of the upper respiratory tract caused by the _________ species
a. Brucella
b. Bordetella
c. Pasteurella
d. Francisella
B
Pertussis is a highly contagious, acute infection of the upper respiratory tract caused primarily by Bordetella pertussis and less commonly by Bordetella parapertussis.
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A deletion in an operon removes the promoter. How will that affect the transcript that is produced from the operon?
A. The transcript will be produced and normal in length B. The transcript will be produced, but shorter than normal C. The transcript will be produced, but longer than normal D. The transcript will produced, but will contain a deletion E. The transcript will not be produced
Which of the following are examples of molecular homologies? Select all that apply.
_____ Use of DNA as an information storage molecule. _____ The lack of an IGF-1 gene in prokaryotes. _____ Similarities among in the metabolic process for the break down of glucose. _____ The biochemical pathways for cellular respiration in plants and animals. _____ The biochemical pathways for photosynthesis in plants and cellular respiration in animals.
Four of these factors have played a part in the extinction of honeycreepers in Hawaii. Which one is the exception?
a. loss of habitat b. human activities c. imported species d. depletion of the ozone layer e. disease
Adult giraffes can be up to 20 ft. tall, and thus require special adaptations to maintain appropriate blood pressure. One adaptation is the rete mirabile, a group of blood vessels that form a web or net-like structure to slow blood flow.Although especially useful to the giraffe, the rete mirabile is similar to a countercurrent heat exchange system in other related, less evolved, mammals. Thus a mechanism for ________ homeostasis is likely to have evolved from a mechanism previously used for ________ homeostasis.
A. blood pressure; temperature B. blood pressure; pH C. temperature; blood pressure D. pH; blood pressure