Ultraviolet light damages DNA by causing
A) purine rings.
B) strand breaks.
C) thymine dimers.
D) radioactivity.
C) thymine dimers.
You might also like to view...
Which of the following enzymes relieves the strain in DNA introduced by unwinding in E. coli?
A. gyrase B. ligase C. primase D. helicase E. SSB
When insect populations exposed to insecticides develop resistance to these toxic chemicals over time, it is an
example of natural selection ____.
a. changing nonmorphological traits b. altering reproductive mechanisms c. acting in a goal-oriented manner d. replacing morphological characteristics e. facilitating mutations in populations
How is it that the cells in different body tissues are able to perform different functions?
A) The cells exhibit different patterns of gene expression. B) Different chromosomes have been inactivated in different cells. C) The cells contain different genes. D) The mutations that have accumulated in the cells of the different tissues control functions.
Which model currently describes the structure of the plasma membrane?
A. endosymbiont model B. induced-fit model C. plasmagel-plasmasol model D. lock and key model E. fluid-mosaic model