According to the fluid mosaic model of cell membranes, the fluid part of the model refers to ____
a. the constant movement of the hydrophilic tails in the interior of the membrane
b. a thin layer of water found sandwiched between the two layers of phospholipids
c. the phospholipid molecules which vibrate, spin, and exchange places within the same
layer of the bilayer
d. the free movement of cholesterol molecules within the membrane
e. the frequent flip-flop of phospholipids from one side of the membrane to the other
C
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In healthy adult humans, normal systolic pressure is ____ mm Hg and normal diastolic pressure is ____ mm Hg
a. 20 to 50; 5 to 20 b. 60 to 80; 90 to 120 c. 90 to 120; 60 to 80 d. 90 to 120; 130 to 150 e. 130 to 150; 90 to 120
Respond to statements 47–52 in reference to the six organization
terms listed below. a. cell b. organ system c. growth d. organ e. development f. tissue M 47. This term describes the successive stages in the formation of specialized tissues—qualitative. M 48. This is a collection of tissues specialized for common function. M 49. The vertebrate circulatory system is a good example. D 50. Here cells are working together for a specialized function. D 51. This is a quantitative term describing an increase in cell numbers. E 52. This is the smallest unit of life.
Which of the following develops into the male genital ducts?
A. Wolffian ducts B. epididymis C. Mullerian ducts D. cloaca E. urogenital groove
The DNA of some archaeons is stabilized by association with archaeal histone proteins forming particles resembling eukaryotic nucleosomes.
Answer the following statement true (T) or false (F)