The pigment responsible for photoperiodism is

a. chlorophyll.
b. xanthophyll.
c. anthocyanin.
d. phytochrome.
e. phytoerythrin.


Answer: d

Biology & Microbiology

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Infection with Streptococcus pyogenes (bacterium that causes strep throat) may generate antibodies or T cells that react with heart muscle, which has a similar structure to the surface of S. pyogenes. These antibodies can damage heart muscle with autoimmune attacks, leading to rheumatic fever. This is an example of which of the following?

a. immunodeficiency b. delayed hypersensitivity c. autoimmune molecular mimicry d. immediate hypersensitivity

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Many chronic medical conditions have been found to be associated with microbial agents.

Answer the following statement true (T) or false (F)

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Exocrine glands secrete all of the following EXCEPT ____

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Biology & Microbiology

The human germ cell line (23 pairs of homologous chromosomes) allows for how many combinations of maternal and

paternal chromosomes every time a gamete is produced? a. 223 b. 232 c. 8 d. 8,000 e. 23

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