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TLS Online TPP Program

#Question id: 11145

Two fundamental concepts about the ion channels of a "resting" neuron are that the channels ________.

#XL - T Zoology
  1. are always open, but the concentration gradients of ions frequently change
  2. are always closed, but ions move closer to the channels during excitation
  3. are open or closed depending on their type, and are specific as to which ion can traverse them
  4. open in response to stimuli, and then close simultaneously, in unison
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TLS Online TPP Program

#Question id: 3487

#XL - T Zoology

Which of the following is true of innate behaviors?

A) Genes have very little influence on the expression of innate behaviors.

B) Innate behaviors tend to vary considerably among members of a population.

C) Innate behaviors are limited to invertebrate animals.

D) Innate behaviors are expressed in most individuals in a population across a wide range of environmental conditions.

E) Innate behaviors occur in invertebrates and some vertebrates but not in mammals.
TLS Online TPP Program

#Question id: 4200

#XL - T Zoology

 At the beginning of translocation, the growing peptide chain is attached to tRNA located at the __ on the ribosome.
TLS Online TPP Program

#Question id: 27207

#XL - T Zoology

ATP is a
TLS Online TPP Program

#Question id: 19678

#XL - P Chemistry

Which of the following is the IUPAC name of the chemical in which an ethyl group replaces one hydrogen of ammonia?
TLS Online TPP Program

#Question id: 27437

#XL - R Botany

Biological species concept” is proposed by____