In which direction does DNA synthesis proceed?
a. From the beginning of the parent strand
b. Wherever DNA ligase is first present
c. From the 5' to the 3' end of the DNA strand
d. From the 3' to the 5' end of the DNA strand
e. From both the 5' and the 3' ends of the DNA strand
c
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Type II restriction endonucleases
A) are heterodimers. B) natively function to methylate specific nucleotides and prevent foreign DNA from being incorporated into the genome. C) recognize nucleotide sequences that are palindromic. D) require ATP energy to cleave dsDNA.
Hydrophobic reactions of phospholipids may produce clusters of their fatty acid tails, which form
a. a lipid bilayer. b. hydrolysis of the fatty acids. c. a protein membrane. d. a cytoskeleton. e. a nonpolar membrane.
One of the major causes of the endangerment of giant pandas is ____.
A. habitat loss and fragmentation B. increasing the effects of chemical pollution C. a sexually transmitted disease that plagues the giant pandas D. introduced exotic species into giant panda habitat E. the excess withdrawal of water from their habitat
The megaspore divides mitotically, resulting in a female gametophyte or embryo sac that differentiates into an egg and a central cell with two nuclei called the
What will be an ideal response?