The primary reservoir for calcium that is released during excitation-contraction coupling in a skeletal muscle fiber is the
A. troponin.
B. endoplasmic reticulum.
C. transverse tubules.
D. sarcoplasmic reticulum.
E. Golgi bodies.
Answer: D
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Why does mismatch repair not lead to mutation upon repair of heteroduplex DNA?
A. The incorrect base is recognized because it is methylated. B. The strand containing the misincorporated base is methylated. C. The strand containing the misincorporated base is not methylated. D. The strand containing the misincorporated base is phosphorylated. E. Actually, mismatch repair does lead to mutation about 50% of the time.
Match the following items with the correct phrases.
_______1. The end product of ____________________ is a messenger RNA molecule. _______2. Combining two monosaccharides to form a disaccharide is an example of ____________________. _______3. James Watson and Francis Crick were the first to publish an article describing ____________________. _______4. The end product of ____________________ is a protein. _______5. Breaking the bond in a disaccharide to produce two monosaccharides is an example of ____________________. a. a dehydration synthesis reaction b. DNA replication c. a hydrolysis reaction d. transcription e. translation
The first autotrophs probably were _____ and produced _______.
A. photosynthetic, oxygen. B. photosynthetic, no oxygen. C. eukaryotic, oxygen. D. eukaryotic, no oxygen.
The most common fatal genetic disorder of Caucasians is
A. sickle cell anemia. B. muscular dystrophy. C. cholera. D. cystic fibrosis. E. hemophilia.