Once infected with Trypanosoma brucei, the patient's immune system cannot clear the infection and develop immunity because the parasite
A. has flagella that allow it to travel all over the body.
B. matures into infectious trypomastigotes.
C. reproduces by binary fission.
D. changes its glycoprotein surface antigens every time it replicates.
E. invades the central nervous system.
Answer: D
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In the experiments constructed by Pasteur to disprove spontaneous generation, swan-necked flasks were used. Why was this shape of flask used in this experiment?
A. The shape of the glass neck allowed the bacteria into the flask and then into the media, but air could not enter. B. Because the glass necks were stretched out, the heat used to sterilize the medium inside of the flask could not kill the bacteria in the neck. C. The glass necks needed to be open to the air, yet constructed so that bacteria would settle in the lowest part of the neck. D. These flask shapes were the easiest and cheapest to produce.
The presence of bicarbonate ions in the blood has an important direct effect, aside from the transport of CO2, that involves
A) altering the affinity of hemoglobin for oxygen. B) stimulating the proliferation of alveolar epithelial cells. C) altering the activity of carbonic anhydrase. D) altering the activity of several receptors. E) maintaining acid-base balance.
The use of SNPs for analyzing genomes is based on ____.
A. the nucleotide base pairing in the SNPs B. the types of nucleotides in the SNPs C. differences in SNPs among individuals D. the ratio of purines to pyrimidines in SNPs E. bonding patterns between nucleotides in the SNPs
The ________ develops where the vertebral column will later form
Fill in the blank(s) with correct word