How does Helicobacter pylori cause gastric ulcers in humans?

A) It neutralizes the acids of the stomach.
B) It causes the production of excess acid in the stomach.
C) It damages the stomach's mucus coat.
D) It causes the stomach to produce stronger acids.


C

Biology & Microbiology

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Ability of cells to form cell-cell adhesions is fundamental to multicellularity

A. true B. false

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A. true B. false

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When two genes are located on different chromosomes, ____ of the offspring from a testcross for genetic linkage

should have a recombinant phenotype

a. over 75% b. about 50%

c. about 25% d. about 10% e. about 5%

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The complement system includes all of the following EXCEPT

a. a group of several plasma proteins. b. induces a cascade of proteins that counteract invasion by coating the invading cells. c. attracts phagocytic leukocytes to attack invading cells. d. causes the lysis of the plasma membranes of invading cells. e. blocks the virus from entering into healthy cells.

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