Mendel was able to identify predictable patterns of heredity. He succeeded mainly because he chose to study traits that
A.) were always dominant.
B.) tended to be recessive.
C.) could be diluted.
D.) had only two forms.
Answer: D.) had only two forms.
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When neurons are not producing electrical signals, there is still a voltage difference across their membranes. What is this voltage called?
A. channel-gate bias B. electrolyte voltage C. equilibrium potential D. resting potential E. ion current
If one compares the forearm of a human, dog, bird, and whale and finds that they indicate common ancestry, what would we call these structures?
a. vestigial structures b. archetype features c. homologous structures d. ancestral forms
What is the inorganic soil constituent with the finest particles?
a. clay b. gravel c. humus d. sand e. silt
Presently, it is thought that organic polymers may have formed and accumulated on:
a. silt and sand. b. sand and mud. c. rocks and clay. d. water and shells. e. sand and heavy metals.