The folding of a polypeptide into a three-dimensional shape is its (secondary/tertiary/quaternary) structure
What will be an ideal response?
tertiary
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To reduce or eliminate disease-/spoilage-causing organisms, food is often subjected to
A. heat. B. chemical additives. C. radiation. D. cold. E. All of the choices are correct.
What is the inorganic soil constituent with the finest particles?
a. clay b. gravel c. humus d. sand e. silt
Steroid hormones are structurally related to
1.DNA. 2.cholesterol. 3.proteins. 4.phospholipids. 5.sugars.
Although birds and mammals descended from different ancestors, they both have a four-chambered heart. This is the result of
A) the simplification of the cardiovascular system. B) the necessity for rapid movement of blood. C) convergent evolution. D) genetic aberrations that resulted from mistakes in somatic cell division.