Prions affect the

A. respiratory system.
B. gastrointestinal tract.
C. nervous system.
D. lymphatic system.


C

Biology & Microbiology

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A bacterium is found that can photosynthesize in the presence of light but uses hydrogen sulfide and releases elemental sulfur as a bi-product. This organism can best be classified as a 

A. chemolithoautotroph. B. chemoheterotroph. C. photoautotroph. D. photoheterotroph. E. pathogen.

Biology & Microbiology

Choose the correct order of tracheal system structures from most external to most internal

a. spiracles, tracheae, tracheal branches, tracheoles b. tracheoles, tracheae, tracheal branches, spiracles c. tracheoles, tracheal branches, tracheae, spiracles d. spiracles, tracheal branches, tracheae, tracheoles

e. spiracles, tracheoles, tracheae, tracheal branches

Biology & Microbiology

The ____________________ theory describes how interactions between actin and myosin produce skeletal muscle

contractions. Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

In bristle worms, what is the name of paired, fleshy extensions of the body wall that are used for locomotion and gas exchange?

a. setae b. parapodia c. septa d. metanephridia

Biology & Microbiology