It is considered healthy to have high levels of high-density lipoproteins (HDL). Why is this true?
A) HDL is a form of saturated fat. B) HDL moves cholesterol to the liver for disposal.
C) HDL moves cholesterol to the heart. D) HDL is important in making complete proteins.
Answer: B
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When cells stop responding to normal controls over growth and division they
a. begin to form a tumor. b. produce a malignancy. c. start to die. d. kill surrounding cells. e. produce scar tissue.
The method of removing vegetative life forms from living surfaces is termed ________.
A. disinfection B. decontamination C. antisepsis D. sterilization
Select the potential problems with using current dispersal barriers (for example, a mountain range) to delineate biogeographical regions. Check all that apply.
A. A barrier for one group of organisms may not be a barrier for another group of organisms. B. Global climate change may change the distribution of taxa and the size and/or location of some of the dispersal barriers. C. The world's biota correspond more closely to political boundaries. D. Human conflicts lead to ever-changing political boundaries. E. Distantly related organisms with similar appearance and habits may exist on either side of a dispersal barrier.
Bacteria that have flagella distributed all over the cell surface are described as (having)
A) monotrichous. B) periplasmic flagella. C) lophotrichous. D) amphitrichous. E) peritrichous.