Diglycerol tetraether lipids ________.
A. form typical bilayer membranes in thermophilic Archaea of the genus Thermoplasma
B. are a characteristic feature of thermophilic Archaea
C. are found in some bacteria and some Archaea
D. tend to make the membrane less rigid
Answer: B
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A CpG island is: (Select all correct choices)
A. a cluster of alternating C and G bases in a small region near or in the promoter site of a gene. B. a cluster of alternating C and G bases found anywhere along a DNA strand. C. a cluster of alternating C and G bases found near bacterial operons.
Oncogenes are ____ to ____
a. dominant; proto-oncogenes b. recessive; proto-oncogenes c. incompletely dominant; proto-oncogenes d. dominant; tumor suppressor genes e. recessive; tumor suppressor genes
Which system maintains the volume and composition of body fluids?
a. integumentary b. immune c. digestive d. urinary e. circulatory
Innate immunity is a defense system that becomes fully functional after it has undergone a period of exposure to various pathogens.
Answer the following statement true (T) or false (F)