Which of the following is a component of the female structure of a flowering plant?
A) petal
B) filament
C) anther
D) stigma
D
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Which feature is common to the hagfish, lamprey, cartilaginous fish, and amphibians?
a. Bony appendages b. Swim bladder or lungs c. Jaws d. Backbone e. Braincase
In nerve cells, the _______ use ATP
a. potassium channels b. sodium channels c. sodium-potassium pumps d. potassium and sodium channels e. sodium channels and the sodium-potassium pump
The membrane potential of a neuron is defined
as the
a. measured capacity of a neuron to create an electrical impulse. b. voltage in the neuron plasma membrane. c. threshold potential of a neuron. d. the electric gradient across a neuron’s plasma membrane. e. amount of voltage it takes to stimulate a neuron to fire.
The first and second lines of defense against microbial invasion are part of
A) innate immunity. B) adaptive immunity. C) species resistance. D) microbial antagonism. E) both species resistance and adaptive immunity.