MHC molecules are found on all of the following cells except ________.
A. islet of Langerhans cells
B. red blood cells
C. epithelial cells
D. leukocytes
E. eosinophils
Answer: B
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Genes under positive control are ____
a. off until they are turned on b. always expressed
c. expressed unless a repressor protein is present d. controlled by several promoters to increase transcription e. regulated by feedback inhibition
Arrange the following going from the earliest to the most recent according to the time they evolved
from a common ancestor. 1) New World monkeys 2) Orangutans 3) Humans 4) Gibbons 5) Gorillas a. 1, 4, 2, 5, 3 b. 1, 2, 4, 3, 5 c. 2, 1, 4, 5, 3 d. 2, 5, 4, 1, 3 e. 3, 5, 2, 4, 1
Which group contains mostly unicellular, eukaryotic organisms?
A) Animalia B) Fungi C) Plantae D) Protists E) Bacteria
A specific type of PRRs that function as signaling receptors, bind the host cell nucleus, and initiate appropriate gene expression are called
A) PAMPs B) Toll-like receptors (TLRs) C) MHC Class I receptors D) MHC Class II receptors