Which of the following statements concerning pathogen-associated molecular patterns (PAMPS) is
false?
a. They are features of pathogens recognized by cells of animals.
b. They trigger activation of phagocytes.
c. They react with specific receptors on host cells.
d. They are found on all microbes except viruses.
e. An example is the peptidoglycan of grampositive bacteria.
D
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Which of the following is smallest?
A) ribosome B) virus C) protein D) mitochondrion E) bacterium
The insulation that keeps the signal within the axon is called what?
a. myelin sheath b. glial bodies c. Nodes of Ranvier d. axon terminals
How do antigen-presenting cells (APCs) acquire the epitopes for presentation?
a. direct infection of the APC b. exocytosis or secretion c. phagocytosis or endocytosis d. diffusion
Different modification of the histone have different effects on gene expression. For instance, the ninth amino acid of histone 3 is a lysine (H3K9 ) can be acetylated once or methylated up to three times. Which of the following is true regarding H3K9
modification? A) If H3K9 is acetylated, then the gene will be repressed. B) If H3K9 has a single methyl group, then the gene will be repressed. C) If H3K9 has two methyl groups, then the gene will be activated. D) If H3K9 has three methyl groups, it is maximally activated compared to only having one methyl group. E) If H3K9 has three methyl groups, then the gene will be repressed.