If two different alleles are expressed in the phenotype equally and distinctly, such as the A and B blood groups, we call these alleles _________
Fill in the blank(s) with the appropriate word(s)
Answer: heterozygous
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Cell-cell communication in plants takes place via specialized structures called
A) plasmodesmata. B) desmids. C) gap junctions. D) cell wall pores. E) connexons.
Which of the following represents the correct organization of ecological systems from the lowest to the highest level of organization?
A) individual, biome, biosphere, community, population, ecosystem B) individual, community, population, ecosystem, biosphere, biome C) individual, population, community, ecosystem, biome, biosphere D) individual, population, community, biome, biosphere, ecosystem
Hox genes are known to be important for: (check all that apply)
A. spatial patterning. B. apoptosis. C. cell-cell adhesion. D. cell metabolism.
Addictive drugs that make people feel good, such as cocaine and methamphetamine, block the uptake of which of the following neurotransmitters in the brain?
A) Acetylcholine B) GABA C) Nitric oxide D) Dopamine E) Serotonin