Which genetic disorder is caused by an expansion mutation?
a. cystic fibrosis
b. muscular dystrophy
c. color-blindness
d. fragile X syndrome
e. sickle-cell anemia
ANSWER: d
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Drifting freely in the upper, well-illuminated waters of the ocean, a diverse biological community exists, primarily consisting of microscopic organisms called
A. phytoplankton. B. archaeans. C. detritus. D. benthos. E. bacteria.
What are the characteristics of red light, which is absorbed by chlorophylls?
A. Its photons have the shortest wavelength in the visual spectrum B. Its photons have the highest energy in the visual spectrum C. Its photons have the longest wavelength in the visual spectrum D. It is not considered a part of the visual spectrum
Briefly describe how toxic materials like DDT that have low concentrations in the water column affect organisms at distant locations
What will be an ideal response?
Neurons that carry messages from sensory receptors to the CNS are
a. sensory. b. motor. c. interneurons. d. both a and b.