A doctor discovers that her patient can produce antibodies against some bacterial pathogens, but he is unable to protect himself against viral infections. The doctor suspects a disorder in her patient's

A. B cells.
B. plasma cells.
C. cytotoxic T cells.
D. suppressor T cells.
E. macrophages.


C. cytotoxic T cells.

Biology & Microbiology

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Monosaccharides may be characterized by all

EXCEPT which of the following? a. a ketone group b. carbon, hydrogen, and oxygen in a 1:2:1 ratio c. a backbone of five to six carbon atoms d. one aldehyde group e. the presence of glycerol and fatty acids

Biology & Microbiology

World human population in 2011 was approximately

A. 5 billion. B. 800 million. C. 10 billion. D. 7 billion. E. 670 million.

Biology & Microbiology

Mantled howler monkeys have been found to obtain most of their food from relatively rare trees, even though finding these trees takes much longer than finding common trees. Nutritional analyses of both rare and common trees found that the rare trees tended to be higher in protein and water, while the common trees tended to be higher in crude fiber and plant secondary compounds. What process would maintain this behavior in mantled howler monkey populations?

A. habituation B. imprinting C. natural selection D. sexual selection E. visual communication

Biology & Microbiology

What compound does the Citric acid cycle start?

What will be an ideal response?

Biology & Microbiology