The three-dimensional coordinates of atoms within a folded protein are determined experimentally. After researchers obtain a protein's structural details, they can use different techniques to highlight particular aspects of the structure
What visual model best displays a protein's secondary structures (? helices and ? sheets)?
(a) ribbon
(b) space-filling
(c) backbone
(d) wire
(a) Space-filling and wire models illustrate all atoms, which makes it difficult to see the secondary structure. Backbone models are better but not as good as the ribbon models, which are stylized and make it easy for even the untrained eye to see secondary structures.
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Chemical elements needed in trace amounts for biochemical reactions have a biogeochemical cycle, including boron, chromium, manganese, and cobalt.
Answer the following statement true (T) or false (F)
__________ are evidence of life in the distant past. Fill in the blank(s) with the appropriate word(s)
The more morphological characteristics that two species of animals share, the more likely it is that they:
a) live in the same habitat. b) have evolved by genetic drift. c) have hybridized. d) have evolved by convergent evolution. e) share a common descent.
Which of the following statements regarding ELISAs is TRUE?
A) They are not quantitative. B) They require large amounts of serum. C) The antibody label is a fluorescent molecule. D) They can be used to detect antibody or antigen. E) They involve the use of membrane filters.