The complement system is a group of ____
a. vaccines
b. defense proteins
c. antibodies
d. antibiotics
e. lymphocytes
ANSWER: b
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Some invertebrates move gases across their cell's membrane by ___ through interstitial fluid
a. active transport b. facilitated diffusion c. bulk transport d. diffusion e. osmosis
Which phylum contains the greatest diversity of animal species?
A. Chordata B. Echinodermata C. Annelida D. Arthropoda E. Mollusca
The plasma membrane barrier to passive diffusion is primarily a function of the membrane's
a. phospholipids. b. cholesterol. c. proteins. d. glycoproteins.
What is the function of RNA polymerase?
A. It proceeds slowly along the DNA strand, requiring about a minute to add two nucleotides to the growing mRNA molecule. B. It unwinds the double helix and adds nucleotides to a growing strand of RNA. C. It adds nucleotides to the 5' end of the growing mRNA molecule. D.It relies on other enzymes to unwind the double helix. E. All of the above.