If a kelp farmer wanted to maximize her harvest, which type of echinoderm would she be most concerned about in the habitat?
A) sand dollars
B) brittle stars
C) sea stars
D) sea urchins
E) sea cucumbers
Answer: D
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Gas exchange between the air and a cell in an insect tracheal system occurs at the ____
a. trachea b. tracheal branches c. gill filaments d. tracheoles e. spiracles
Auditory information travelling from the cochlea toward the brain passes through several structures. Which order is correct?
a. cochlea to primary auditory cortex to the medulla to the pons b. cochlea to cortex pons to medulla to the primary auditory cortex c. cochlea to medulla to pons to primary auditory d. cochlea to medulla to primary auditory cortex to the pons
How small is the smallest object that can be seen with a light microscope?
a. 2 µm b. 0.2 µm c. 2 nm d. 0.2 nm
Why does FADH2 yield less ATP than NADH?
a. FADH2 electrons ultimately do not go to oxygen. b. FADH2 electrons enter the electron transport chain at a lower energy level. c. FADH2 binds directly to the ATP synthase enzyme. d. Electrons from FADH2 cannot pump hydrogen ions out of the cell.