When cells are metabolically active but not dividing, they are in the ________ phase
A) stationary
B) log
C) lag
D) death
E) exponential
C
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Suppose that plasma membranes were single layers of phospholipids rather than double layers, and the heads faced the extracellular fluid. The interior of this hypothetical cell would have to be
A) nonpolar only. B) hydrophilic only. C) polar only. D) hydrophobic only. E) hydrophobic and nonpolar.
Which of the following statements about the cells of the mucous membrane lining air tubes of humans is false?
A) They manufacture secretory products. B) They are stratified squamous epithelial cells. C) They are cuboidal or columnar in shape. D) They have cilia that collect and transport mucus up and out of the respiratory system.
Which statement about temperate broadleaf forests is true?
A) Temperate broadleaf forests have a narrow range of temperatures over the course of a year. B) Oak, hickory, birch, beech, and maple are common trees in temperate broadleaf forests. C) Temperate broadleaf forests have very poor soil. D) Temperate broadleaf forests are less open than tropical rain forests.
What stimulates secretion of testosterone by Leydig cells?
A. FSH B. Testosterone C. Estradiol D. LH E. Progesterone