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

Biology & Microbiology

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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

Biology & Microbiology

The bond in which bonded atoms share electrons is called a(n) ________

A) ionic bond B) covalent bond C) hydrogen bond D) polar bond

Biology & Microbiology

Did Pangea or Gondwana form first?

What will be an ideal response?

Biology & Microbiology

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.

Biology & Microbiology