The refractory period of a neuron plasma membrane is important because
a. it establishes the resting potential.
b. it initiates an action potential.
c. it ensures that the threshold potential will be reached.
d. it ensures that an impulse will travel in a one-way direction.
e. in resets the threshold potential.
D
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A peptide has the sequence NH2-phe-pro-lys-gly-phe-pro-COOH. Which of the following sequences in the coding strand of the DNA could code for this peptide?
A) UUU-CCC-AAA-GGG-UUU-CCC B) AUG-AAA-GGG-TTT-CCC-AAA-GGG C) TTT-CCC-AAA-GGG-TTT-CCC D) GGG-AAA-TTT-AAA-CCC-ACT-GGG E) ACT-TAC-CAT-AAA-CAT-TAC-UGA
Fungi are made of bundles of threadlike ________.
A. chitins B. mycelia C. lichens D. hyphae
A fish circulatory system is indicated by the letter (s) ____
a. A only b. B only
c. C only d. both A and B e. both B and C
A child blows up a balloon with air, the balloon will not float to the ceiling because
What will be an ideal response?