Which of the following describes the classical pathway of complement activation?
A) Complement proteins activate when mannose-binding lectin binds to the pathogen.
B) Complement proteins activate by coming into contact with certain blood-clotting proteins.
C) Complement proteins activate when triggered by macrophages or neutrophils.
D) Complement proteins activate when antibodies bind to a pathogen.
E) Complement proteins activate by directly interacting with the pathogen.
Answer: D
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Answer the following statements true (T) or false (F)
1. G proteins and Ras are activated when bound to guanosine diphosphate. 2. One common feature with G-protein coupled, enzyme-linked, and growth factor receptors is that their activation leads to activation of protein kinases. 3. Cyclic AMP activates protein kinase C in producing a cell response. 4. If IP3 binds a Ca2+ ligand-gated ion channel in the endoplasmic reticulum then cytosolic Ca2+ levels will rise in the cell.
Four of the five features listed below are related by a
common biome. Select the exception. a. treeless b. permafrost c. short growing season d. found in the rain shadows e. located above the Arctic Circle
All of the following are adaptations of black-tailed prairie dogs except:a
digestive tracts modified to easily digest seeds and leaves of grasses. b. omnivores. c. live underground. d. hibernate throughout the winter. e. live in large social groups.
Nucleotide analogs cause frameshift mutations
Indicate whether the statement is true or false