The hydrogen, ionic, and covalent bonds that stabilize the shape of a protein contribute to which level of structure of a protein?
A) primary
B) quaternary
C) secondary
D) tertiary
D
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Four of the following statements correctly describe lichens. Which statement is the exception?
a. They inhabit harsh environments. b. They contain a club fungus. c. They may have proceeded the evolution of land plants. d. They may be a mutualism between and alga and a fungus. e. They can contain cyanobacteria.
All of the following are necessary for contraction to occur EXCEPT which one?
A) Calcium levels must increase in close proximity to the contractile proteins. B) ATP must be present. C) Troponin-tropomyosin complex must shift out of the way. D) Cross-bridges must form between actin and myosin. E) The troponin and tropomysin must slide relative to each other, shortening the sarcomere.
Suppose that you extract all of the proteins of a leaf and measure the percentage that is rubisco. What percentage of the leaf proteins will the rubisco comprise?
a. 10% b. 25% c. 50% d. 75%
Winogradsky columns ________.
A. are used in the process of isolating nanobacteria B. are used in the process of isolating aquatic viruses (virioplankton) C. are typically used to isolate aquatic protozoa D. are used as a model system for studying microbial interactions