Both smooth muscle fibers and cardiac muscle fibers:a
have striations.
b. are under involuntary control.
c. are multinucleate.
d. have a comparable resistance to fatigue.
e. have a comparable intermediate speed of contraction
b
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Protein X contains four transmembrane domains, a short N-terminus and a long C-terminus. Following protein synthesis, the N-terminus of the protein faces the lumen (the inside) of the ER. After protein X is transported to the cell surface via exocytosis, you would expect the N-terminus of protein X to be
A. extracellular. B. cytoplasmic. C. in the lumen. D. in the lipid bilayer of the plasma membrane.
In what ways do human X and Y chromosomes differ from one another?
A. The X chromosome is larger than the Y. B. The X chromosome has about 1,000 genes and the Y has only about 50. C. The X chromosome is found only in females, while the Y is found only in males. D. The X and Y chromosomes differ both in size and in number of genes. E. The X and Y chromosomes have no regions in common and do not pair during meiosis.
It has been suggested that chaperonin overexpression in cells promotes genetic variation and enzyme evolution. This is probably because chaperonins can:
A. alter the accuracy of transcription. B. alter the accuracy of translation. C. promote degradation of less stable protein variants. D. promote folding of less stable protein variants. E. form aggregates with increased binding capabilities.
A dung beetle is an example of a:
A) producer. B) detritivore. C) secondary consumer. D) tertiary consumer. E) primary consumer.