The zygote is converted into the morula in the ____
a. ovary
b. uterus
c. vagina
d. oviduct
e. cervix
ANSWER: d
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Trichoplax adhaerens has no nerve cells, but
scientists have discovered a. genes that encode signaling molecules. b. a response to harsh chemicals. c. movement toward a food source. d. adherence genes. e. none of these.
Reef systems
a. be all be destroyed within 30 years. b. are formed from calcium carbonate secreted by coral polyps. c. have symbiotic dinoflagellates in the living coral. d. have shown widespread bleaching; death of corals is being reported worldwide. e. include all of these.
In which condition are both alleles expressed in the heterozygous phenotype?
A) pleiotropy B) codominance C) epistasis D) complete dominance
The hydrologic cycle involves
A. the formation of water molecules from hydrogen and oxygen in the atmosphere. B. the manufacture of water during photosynthesis in plants. C. the consumption of water during aerobic cellular respiration. D. None of these answers is correct.