Based on composition similarities, actin can be divided into two major groups: the muscle-specific actins (________-actin) and nonmuscle actins (________- and ________-actin).
Fill in the blank(s) with the appropriate word(s).
alpha; beta; gamma
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When a neurotransmitter released from one neuron binds to a ______ on a second neuron, that neuron depolarizes and fires.
A. G-protein coupled receptor B. nuclear receptor C. voltage-gated ion channel D. enzyme-linked receptor E. ligand-gated ion channel
The bond in which bonded atoms share electrons is called a(n) ________
A) ionic bond B) covalent bond C) hydrogen bond D) polar bond
Did Pangea or Gondwana form first?
What will be an ideal response?
Hunters waiting to kill "prize bucks" over smaller white-tailed deer can possibly change allele frequencies of the deer population. If smaller deer are speared this could lead to
A. no adverse effects on the white-tailed deer species. B. a founder effect, from hunting, will allow small groups of larger white-tailed deer to establish habitats away from human populations. C. directional selection for smaller white-tailed deer will result in fewer "prize bucks." D. natural selection of deer with large antlers. E. a bottleneck effect, from hunting, that will cause extinction of the white-tailed deer.