Protein structures have several different levels of organization. The primary structure of a protein is its amino acid sequence. The secondary and tertiary structures are more complicated
Consider the definitions below and select the one that best fits the term "protein domain."
(a) a small cluster of ? helices and ? sheets
(b) the tertiary structure of a substrate-binding pocket
(c) a complex of more than one polypeptide chain
(d) a protein segment that folds independently
(d)
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Which of the following is not a general requirement for complex multicellular life?
A. Cells must retain a full range of functions, including reproduction. B. Cells must stick together. C. Cells must communicate with one another. D. Cells must participate in a network of genetic interactions that regulate cell division. E. All of these options are requirements for complex, multicellular life.
The frozen contraction of muscle cells called rigor mortis occurs after death because ____
a. ions are not available in the cytoplasm of muscle cells b. tropomyosin breaks down quickly c. crossbriges become very rigid structures d. ATP production stops e. muscle cells are flooded with neurotransmitters
__________ are used by crustaceans for detecting the pull of gravity
A. Antennal glands B. Maxillae C. Draglines D. Statocysts E. Swimmerets
When a young, vigorously growing culture of bacteria is transferred to fresh medium of the same composition, the lag phase is usually short or absent.
Answer the following statement true (T) or false (F)