The sickle cell allele is spread through the population in West Africa and maintained at a high
frequency due to ____________________ advantage. Fill in the blank(s) with the appropriate word(s).
ANS: heterozygote
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When considering nomenclature for scientific names, what is the difference between the two primates, Homo sapiens and Homo erectus?
A. One is a primate but the other is not. B. They are animals of a different kingdom. C. They are animals of a different order. D. They are animals of a different species. E. They are animals of a different genus.
Oxygen has an atomic mass of 16 and an atomic number of 8.
A. Oxygen has 16 neutrons. B. Oxygen has 8 electrons. C. Oxygen can form two bonds with other atoms. D. Oxygen has 16 neutrons and 8 electrons. E. Oxygen has 8 electrons and can form two bonds with other atoms.
Which of the following statements about the colon is NOT true?
A. The colon is active in water absorption, removing about 95% of the water that enters it and returning it to the bloodstream. B. Feces consists of about 25% water and 75% solids that are mainly bacteria from the intestinal tract. C. Insufficient absorption of water can result in diarrhea that may be life-threatening. D. Cells in the walls of the large intestine absorb vitamin K that is produced by bacteria resident in the colon. E. The last section of the colon is the rectum, which terminates in the anus.
A symbiotic association between a fungus and a green alga or a cyanobacterium is called a
A. protist. B. mycorrhiza. C. mushroom. D. kelp. E. lichen.