Mutations are the original source of new alleles, but many are __________ or __________. Fill in the blank(s) with the appropriate word(s)
lethal; neutral
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The spread of an action potential through heart tissue is made possible by
A. gap junctions. B. tight junctions. C. a network of neurons in the heart. D. myogenic junctions. E. synaptic clefts.
Indifferent gonads develop
A) during the first two weeks of prenatal development. B) during the fifth week of prenatal development. C) during the ninth week of prenatal development. D) when the embryo becomes a fetus.
How is Chaga’s disease transmitted?
a. The Anopheles mosquito bites the victim and passes Trypanosoma gambiense via the saliva. b. The Glossina tsetse fly bites the victim and passes Trypansoma brucei in the feeding tube. c. The kissing bug (Triatoma) bites the victim, defecates in the wound, and passes Trypanosoma cruzi to the victim in the feces. d. The victim drinks water contaminated by the feces of an organism with an active infection and Giardia lamlia is in the water.
____ is water pressure inside the vacuole of a plant cell.
A. Active transport B. Diffusion C. Turgor pressure D. Exocytosis E. None of the above