Which of the following is not a benefit or advantage of using mass spectrophotometry?
A. Proteins can be sequenced by mass spectrophotometry.
B. The mass of a protein can be determined and lead to its identification.
C. Changes in mass due to binding of cofactors, bound metal ions, and covalent modifications can be measured.
D. If protein is enzyme, sequence information includes three-dimensional structure of active site.
E. Fragments of the protein may permit unambiguous association with its gene.
D
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The cell's plasma membrane mediates which of the following transactions with the environment? Choose all that apply.
_____ Ingesting food molecules and sometimes entire cells _____ Returning waste and other molecules back to the environment _____ Responding to a host of chemical cues _____ Directing synthesis of various food-digesting proteins _____ Passing messages to other cells
Sponge gemmules
a. are used in respiration. b. capture food. c. function in excretion. d. serve in digestion. e. are reproductive agents.
What is meant by the "coupling of chemical reactions"? Provide two relevant biological examples to help explain the
importance of this process to living organisms. What will be an ideal response?
The emergence of many diverse species from a common ancestor that finds itself in a new environment is called
A) adaptive radiation. B) gradualism. C) disruptive selection. D) allopatric speciation. E) hybridization.