What is TRUE of restriction enzymes?
A. They catalyze the formation of hydrogen bonds between DNA fragments.
B. There are less than 10 restriction enzymes known.
C. They are not naturally produced by bacteria, but are bioengineered by humans.
D. They cut at random sites within a genome.
E. They protect bacterial cells from invasion by foreign DNA.
Answer: E
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Which macromolecule did the majority of scientists favor as the "first" to be found in protobionts?
A. DNA. B. RNA. C. Amino acids. D. Proteins.
In polar covalent bonds
1.one atom has a stronger attraction for the shared electron than the other. 2.both atoms share the electrons equally. 3.the bonds are the result of ions being formed. 4.the atomic mass is altered.
Loose connective tissue proper contains
A) fixed and wandering cells B) a tight framework C) parallel, packed fibers D) a solid ground substance E) only elastic fibers
Mitosis is cell division that produces somatic cells, while meiosis produces ________.
What will be an ideal response?