Why do physicians often examine the lymph nodes of cancer patients?
What will be an ideal response?
When cancer spreads from its original site, the cells often enter lymphatic capillaries and eventually arrive in lymph nodes, which filter the lymph.
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A dikaryotic cell:
A. has only one haploid nucleus B. has only one diploid nucleus C. has two diploid nuclei D. has two haploid nuclei E. has one haploid nucleus and one diploid nucleus
During the production of beer, the barley must be “malted,” which means it is
a. converted to simple sugars. b. exposed to baker’s yeast. c. exposed to brewer’s yeast. d. fermented.
Of the following, which is the best description of the mutual benefit to both species found in a lichen?
A. The autotroph produces antibiotics to ward off infection by bacteria. B. The autotroph prevents dehydration and the heterotroph provides a carbon source. C. The autotroph provides a carbon source and the heterotroph absorbs moisture and minerals. D. The autotroph produces oxygen and the heterotroph consumes oxygen. E. The heterotroph protects the autotroph from predation.
Each of the following is a characteristic of hormones except
A) synthesis by endocrine tissue cells. B) secretion directly into the bloodstream. C) having a hormone-specific lifespan in the blood ranging from seconds to hours. D) interacting with specific receptors on cells in target tissues throughout the body. E) All are characteristics of endocrine hormones.