Which type of cell directly attacks infected cells?
a. Bacterial cells
b. Helper T-cells
c. Cytotoxic T-cells
d. Cancerous cells
Ans: c. Cytotoxic T-cells
Biology & Microbiology
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What ecological consequences do introduced species have on an area? a. They increase predation pressures on animals
b. They compete with native species. c. All of these choices. d. They introduce diseases.
Biology & Microbiology
Glucose dissolves in water because it
a. ionizes. b. is a polysaccharide. c. is a polar and forms many hydrogen bonds with water molecules. d. has a very reactive primary structure. e. is an isotope
Biology & Microbiology
Which of these molluscs commonly have a coiled shell?
A) gastropods only B) bivalves only C) cephalopods only D) gastropods and bivalves
Biology & Microbiology
DNA runs in _________ directions called an __________.
Fill in the blank(s) with the appropriate word(s).
Biology & Microbiology