A pair of shared valence electrons is referred to as a(n):
A. ionic bond.
B. hydrogen bond.
C. van der Waals interaction.
D. covalent bond.
E. hydrophobic effect.
Answer: D
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If meiosis did not occur in sexually reproducing organisms, then:a
growth of the zygote would be halted. b. mitosis would be sufficient. c. gametes would remain haploid. d. chromosome number would double in each generation. e. eggs would be haploid, but sperm would be di
A phospholipid molecule has a polar and a nonpolar end. Because of this, water molecules form
A. polar bonds with the nonpolar end of the phospholipid molecule. B. polar bonds with the polar end of the phospholipid molecule. C. covalent bonds with the nonpolar end of the phospholipid molecule. D. hydrogen bonds with the nonpolar end of the phospholipid molecule. E. hydrogen bonds with the polar end of the phospholipid molecule.
In a cross-cultural study looking at mate preferences, David Buss (1989) found that both males and females consistently rated ________ as the most important attribute in a mate.
a) Physical attractiveness b) Attention to detail c) Resource holding potential d) None of the above
Sedimentation coefficients are proportional to the molecular weight of a particle and are not affected by the volume and shape of the particle.
Answer the following statement true (T) or false (F)