A and B antigens in human blood are produced by the conversion of ________ by the addition of a sugar group

A) anti-A and anti-B antibodies
B) the H antigen
C) hemoglobin
D) ?-N-acetylgalactosamine
E) anti-O antibodies


B

Biology & Microbiology

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By volume, what percentage of cells in blood are white blood cells?

a. 15 percent b. 50 percent c. 1 percent d. 85 percent

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Nitrogen, with an atomic number of 7, has

____ electrons in the first energy level and ____ electrons in the second energy level. a. 1; 6 b. 2; 5 c. 3; 4 d. 4; 3 e. 5; 2

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Figure 19.4 The spark discharge in the accompanying figure represents ____.

A. sunlight energy in the environment. B. heat energy in the environment. C. electrical energy in the environment. D. ionizing radiation in the environment. E. the explosion of the hydrogen gas to release energy for the reactions.

Biology & Microbiology