Which of the following was most important to lead to the science of molecular genetics?
a. research since the discovery of the structure of RNA that has led to a more thorough understanding of mutations
b. research since the discovery of the structure of DNA that has led to a more thorough understanding of mutations
c. research since the discovery of the structure of DNA that has led to a more thorough understanding of genetics
d. research since the discovery of the structure of RNA that has led to a more thorough understanding of genetics
Ans: b. research since the discovery of the structure of DNA that has led to a more thorough understanding of mutations
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Each of the following is a general characteristic of bryophytes except
A) a cellulose cell wall. B) vascular tissue. C) chlorophylls a and b. D) being photosynthetic autotrophs. E) being eukaryotic.
When cells take on specific structure and function, this is called
A. morphogenesis. B. growth. C. cleavage. D. differentiation. E. fertilization.
The three-dimensional structure of a protein is analyzed most definitively by
a. electron microscopy. b. light microscopy. c. subcellular fractionation. d. X-ray crystallography
Which of the following accounts for the fluid aspect of the fluid mosaic model of plasma membranes?
A) The individual phospholipid molecules are not bonded to one another, so the movement of certain proteins and lipids is possible within and through the bilayer. B) The plasma membrane is "fluid" because of the movement of substances across the membrane. C) One of the components of the membrane is water. D) The membrane is water soluble. E) The bilayer permits diffusion of certain lipid-soluble substances.