Which of the following events must occur before fertilization can happen?
A. fruit development
B. endosperm formation
C. seed coat formation
D. double meiosis
E. pollination
Answer: E
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Which one of the following enabled eukaryotes to evolve complex life cycles and programs of multicellular development?
A. binary fission B. complex patterns of gene regulation C. a dynamic cytoskeleton D. sexual reproduction
Which of the following bonds do not participate in the stabilization of double-stranded DNA as an energetically preferred structure compared with single-stranded DNA?
A. dipole-dipole interactions B. pi orbital stacking C. van der Waals interactions D. phosphodiester bonds E. hydrophobic base-stacking interactions
What is an example of a molecule that can act as both a neurotransmitter and a hormone?
A. estrogen B. progesterone C. thyroxine D. norepinephrine E. insulin
Which of the following groups consume animals?
a. carnivores and herbivores b. carnivores and omnivores c. omnivores and herbivores d. carnivores only e. herbivores only