The bone marrow must continuously generate new red blood cells because the life span of a typical red blood cell is only ________

The life span is even shorter in individuals with sickle-cell trait, which accounts for the protective effects against malaria. Fill in the blank(s) with correct word


100-120 days

Biology & Microbiology

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Which of the following is not a characteristic of normal cells?

A. They grow as a monolayer. B. They grow as multiple layers. C. They undergo a limited number of divisions and then die. D. They stick tightly to the surface of glass culture dishes.

Biology & Microbiology

Although they have a diversity of structures, all members of this group of organic molecules are

primarily nonpolar and thus water-insoluble.

a. proteins b. lipids c. nucleic acids d. carbohydrates e. amino acids

Biology & Microbiology

The original published articles describing the structure of DNA were authored by _____ and _____

a. Crick; Franklin b. Watson and Crick; Franklin c. Wilkins; Franklin d. Wilkins; Watson and Crick e. Watson; Crick

Biology & Microbiology

Drugs delivered in aerosols that dilate bronchioles are used to treat ____________________. Fill in the blank(s) with the appropriate word(s)

Biology & Microbiology