The nucleolus
A) is surrounded by a thin nucleolar membrane.
B) is found, one per cell, in eukaryotes.
C) contains the NOR of rRNA genes.
D) synthesizes ribosomal proteins.
E) all of the above
C) contains the NOR of rRNA genes.
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Which of the following is NOT a function of the integumentary system?
A. Defense against pathogens B. Fluid transport C. Supporting the weight of body structures D. Protection from dehydration E. Regulation of body temperature
What is the dominant photosynthetic pigment found in all types of algae?
a. Chlorophyll b b. Chlorophyll c c. Chlorophyll a d. Phycoerythrin e. Chlorophyll d
Which of the following statements is NOT true?
a. A lipid bilayer is characteristic of all membranes. b. Cellular organelles are associated with membranes. c. In a plasma membrane, a hydrophilic portion is oriented to the outside of the cell. d. Lipid molecules make the cell membrane relatively impermeable to water-soluble substances. e. Even by using extremely high magnification, an electron microscope cannot reveal the substructure of cell membranes.
Precarcinogens are themselves not carcinogens but may be activated to become a carcinogen in the liver by the activity of
A) PTEN. B) Ras. C) EGF. D) Cytochrome P450. E) APC.