Which mutations can interfere with the proper insertion of a protein in the plasma membrane?
A. a nonpolar amino acid to a polar amino acid within a transmembrane domain
B. a polar amino acid to a nonpolar amino acid within a cytoplasmic domain
C. a nonpolar amino acid to a polar amino acid within a cytoplasmic domain
D. a polar amino acid to a nonpolar amino acid within a transmembrane domain
Answer: A
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Skeletal muscles contract in response to _____
a. acetylcholine (ACh) b. dopamine c. serotonin d. endorphins
UV light is used to produce vitamin D. Yet, why do people whose ancestors lived in the tropics have darker-colored skin?
A. Darker-colored skin allowed more production of vitamin D. B. Darker-colored skin protected vitamin D from degradation. C. Darker-colored skin keeps people warmer. D. Darker-colored skin was important for social interactions. E. Darker-colored skin provides protection against cancer-causing UV light.
What did the first fishes probably lack?
A) eyes B) jaws C) gills D) fins
Skeletal muscle contraction is stimulated by the neurotransmitter ______, which is released by nerves at the neuromuscular junction
a) acetylcholine b) nitric oxide c) dopamine d) glycine