What is the difference between an ionic and covalent bond?
A) Ionic bonds form between atoms of different elements; covalent bonds form between atoms of the same element.
B) In an ionic bond, one atom has more electronegativity than the other; in a covalent bond, the atoms have the same electronegativity.
C) Ionic bonding involves the inner electron shells; covalent bonding involves the valence electron shell.
D) In an ionic bond, one atom accepts electrons from the other; in a covalent bond, a pair of atoms share electrons.
Answer: D
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A gene that codes for a protein was removed from a eukaryotic cell and inserted into a prokaryotic cell. Although the gene was successfully transcribed and translated, it produced a different protein than it produced in the eukaryotic cell. What is the most likely explanation?
A. Eukaryotic genes often contain introns while prokaryotic genes do not. B. Eukaryotic transcripts have a 5' cap while prokaryotic transcripts do not. C. There are slight differences in the genetic code for prokaryotes and eukaryotes. D. Unlike eukaryotes, which have three different RNA polymerases, prokaryotes have a single RNA polymerase.
Multiple origins of replication on the DNA molecules of eukaryotic cells serve to
A) remove errors in DNA replication. B) create multiple copies of the DNA molecule at the same time. C) shorten the time necessary for DNA replication. D) assure the correct orientation of the two strands in the newly growing double helix.
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A. 1 B. 2 C. 3 D. 4 E. 5
CAM and C4 plants likely grow in what type of environment?
A. Cool B. Hot and arid C. High altitude D. In water