The infectious dose
A. is the same for all microorganisms.
B. may be 10-100 cells for Salmonella.
C. is expressed as ID50.
D. is defined as the number of microbes necessary to ensure infection.
E. is expressed as ID50 AND is defined as the number of microbes necessary to ensure infection.
E
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Which is the correct pathway of a protein through a cell as it is being made?
A. Nucleus, smooth endoplasmic reticulum, Golgi apparatus B. Ribosome, Golgi apparatus C. Nucleus, Golgi apparatus, ribosome D. Golgi apparatus, ribosome, rough endoplasmic reticulum
Basic life processes account for what percentage of energy use in animals?
A. 70% B. 10% C. 25% D. 50%
Which statement is true of polytomy branches?
a. Organisms in each branch share a common ancestor. b. Polytomy represent mass speciation from a single mutation event. c. The longest branch is the ancestor of the other sister taxa. d. Polytomy branching only occurs in single-celled organisms.
Movable bones are found in the
a. cochlea. b. external ear. c. middle ear. d. inner ear. e. organ of Corti.