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

Biology & Microbiology

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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.

Biology & Microbiology

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.

Biology & Microbiology

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.

Biology & Microbiology

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.

Biology & Microbiology