What is the infectious agent?
•Amylase digests carbohydrates; tissue filtrate still infects healthy test animal.
•Lipase digests fats; tissue filtrate still infects healthy test animal.
•Formaldehyde and/or heat denatures DNA and RNA; tissue filtrate still infects healthy test animal.
•Trypsin digests protein; tissue filtrate does not infect healthy test animal.
Select one:
a. carbohydrate
b. fat
c. protein
d. DNA or RNA
e. Could be carbohydrate, fat, or DNA or RNA but not protein.
c. protein
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The primary role of oxygen in cellular respiration is to _____
A) yield energy in the form of ATP as it is passed down the respiratory chain B) act as an acceptor for electrons and hydrogen, forming water C) combine with carbon, forming CO2 D) combine with lactate, forming pyruvate E) catalyze the reactions of glycolysis
The most common way to follow bacterial transformation with a plasmid is by
A. manufacturing the bacterial protein. B. conferring antibiotic resistance. C. separating the altered cell surface. D. making the cells immortal. E. altering the physical appearance of the cells.
When Dr. Schmidt-Nielsen and his colleagues followed a "pulse" of 100% inhaled oxygen through the respiratory system of an ostrich, the oxygen pulse went to the
A. posterior air sacs to the lung and then to the anterior air sacs before being exhaled. B. anterior air sacs to the lung and then to the posterior air sacs before being exhaled. C. lung and then to the anterior air sacs and finally the posterior air sacs before being exhaled. D. lung and then to the posterior air sacs and finally the anterior air sacs before being exhaled. E. lung and then back out with exhalation—the air sacs were not involved.
Which statement about the B cells' abilities to produce antibodies is most accurate?
A) There are no B cells until an antigen is encountered. B) Most B cells are capable of producing any kind of antibody. C) B cells wait to encounter an antigen and then copy it. D) There may be 100 million different B-cells, each producing a different antibody. E) B cells don't produce antibodies until they develop in the thymus.