When salt dissolves in water as illustrated in the figure above, the water molecules form ____ around
the Na+ and Cl? ions.
a. covalent bonds
b. hydration layers
c. nonpolar interactions
d. membranes
e. ionic bonds
B
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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.
Vaccinations against chicken pox provide individuals with __________ immunity
a. active natural b. active artificial c. passive natural d. passive artificial e. cell-mediated
The advantage of homologous recombination is that ________.
A. following a splice with Cas9, the ends are joined back together with the induction of a frameshift mutation resulting in an inactive protein B. following a splice with a restriction enzyme, the sticky ends can be combined with a piece of donor DNA that has the same sticky ends C. genes from two different sources can be joined together when the wild-types contain homology between the two molecules, allowing DNA ligase to join the naturally-occurring sticky ends D. following a splice with Cas9, the ends of the chromosome can be seamlessly joined with a piece of donor DNA that has been engineering to contain flanking sequences homologous to the broken chromosome ends
How can chromatin be altered?