Which species would be considered more primitive based upon the structure of their limbs?
a. bats
b. stem reptiles
c. porpoises
d. penguins
e. birds
b
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How are the five nucleotides similar to each other?
a. All five are composed of a phosphate group, sugar, and a nitrogenous base. b. All five contain the same nitrogenous base. c. All five have the same number of atoms.
In which structure do cilia covered in mucus trap foreign particles?
a. urinary tract b. reproductive tract c. arteries d. respiratory tract e. digestive tract
. Some success has been achieved in efforts to treat sickle cell disease by the process of
____________________. Fill in the blank(s) with the appropriate word(s).
The most accurate description of SPATIAL summation is
A. Several inputs from the SAME presynaptic cell arrive in rapid succession, summing into a larger depolarization that brings the neuron over the threshold for an action potential. B. Several inputs from DIFFERENT presynaptic cells create EPSPs that sum together to bring the neuron over the threshold for an action potential.