Chromosomes can be condensed into compact structures, visible with the light microscope, but usually only:
A. while the nuclear pores are open.
B. while the proteins are being assembled.
C. after the cell is dead.
D. while the DNA is being copied into RNA.
E. during cell division.
E. during cell division.
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If a helical turn is removed from a closed-circular DNA molecule:
A. only supercoiling will occur. B. only strand separation will occur. C. supercoiling and/or strand separation will occur. D. cruciform DNA will likely form. E. solenoidal DNA will likely form.
Four of the five methods listed below are used to
reduce the number of defective genes in a population. Select the exception. a. genetic counseling b. gene replacement c. mutagen reduction d. diet modification e. genetic screening followed by gene modification
"Glucose sparing" is brought about by
a. epinephrine. b. norepinephrine. c. aldosterone. d. cortisol. e. growth hormone.
The process that accounts for the most changes in the mix of alleles in a gene pool is ____
a. natural selection b. genetic drift c. phenotype variations d. inheritance e. mutations