Which feature has to be present in a protist in order to classify it as a photoautotroph?
A. the presence of a light-trapping pigment
B. the presence of mitochondria within the cell
C. the ability to synthesize inorganic compounds
D. the presence of cellulose in the cell wall
E. the ability to synthesize organic compounds
Answer: A
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Typical conditions used for sterilization are
A. 100?C for 10 minutes. B. 121?C at 15 psi for 15 minutes. C. 80?C for 15 minutes. D. 72?C for 15 seconds.
Where does the lens FOCUS an image in the mammalian eye?
a. on the retina, using the entire surface of the retina b. primarily on the fovea c. on the rods only d. slightly in front of the retina, so the neural cells don't distort the image e. it depends on where you are looking; sometimes on the fovea, sometimes elsewhere on the retina
Botulinum toxin has been used for all of the following purposes except
a. for cosmetic purposes, to treat “dynamic wrinkles.” b. to treat facial and eyelid spasms. c. for OCD and autism. d. to treat dystonias, prolonged muscle contractions. e. for certain types of cerebral palsy.
The process illustrated in Figure 3-1 is called:a
condensation. b. protein synthesis. c. hydrolysis. d. dehydration synthesis. e. denaturation