What is the main difference between covalent and ionic bonds?
a. Ionic bonds share electrons between atoms, while covalent bonds transfer electrons between atoms.
b. Covalent bonds share electrons between atoms, while ionic bonds transfer electrons between atoms.
c. Ionic bonds form between hydrogen and other atoms, while covalent bonds do not use hydrogen.
d. Covalent bonds form between hydrogen and other atoms, while ionic bonds do not use hydrogen.
b. Covalent bonds share electrons between atoms, while ionic bonds transfer electrons between atoms.
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Sea stars belong to the
A. Asteroidea. B. Holothuroidea. C. Echinoidea. D. Crinoidea.
The letter “A” in the above figure represents
a. the root nodules. b. the primary root. c. the primary leaf. d. the cotyledons. e. none of these.
All of the genes shared by a population are its
A. gene frequency. B. gene pool. C. fitness. D. gene flow.
DNA methylation is the only known natural modification of DNA. It affects
A. cytosine bases. B. thymine bases. C. guanine bases. D. adenine bases.