Where is calcium stored in muscle fiber cells?
a. T-tubules
b. sarcoplasmic reticulum
c. muscle fibre cell membrane
d. mitochondria
e. sarcomeres
b
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Why are some proteins synthesized after single-codon mutations still semi-functional?
a. Proteins are transported to the nucleus to be compared to and corrected by the cell’s DNA. b. Degeneracy ensures that all single-codon substitution specify the same amino acids. c. Substituted amino acids may have similar properties as the originally specified amino acids. d. Only the average properties of every amino acid in a protein determine its functionality.
If the ciliary muscle of the eye is damaged, then
a. color vision will be lost. b. the amount of light entering the eye cannot be regulated. c. focusing will be impaired. d. only peripheral vision is available. e. “night blindness” will become more evident.
A challenge to traditional (pre-1860) ideas about species came from embryology, when it was discovered that _____.
A. mutations have a far more dramatic effect on embryos than on adult organisms B. the embryological development of many plants and animals is almost identical C. the more advanced the animal, the more slowly it develops D. embryos of dissimilar organisms, such as sharks and humans, resemble each other E. all animals develop similar embryonic gills
Where in a molecule of ATP is the stored energy that is used by the cell?
A. Within the nitrogenous base, adenine B. Within the five-carbon ribose sugar C. In the covalent bonds between the phosphate groups D. In the bond between adenine and ribose