The first member of genus Homo to use fire is
What will be an ideal response?
Homo erectus
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At which of the following time points in an action potential is a positive feedback process occurring in a neuron?
A. When the neuron is at rest. B. As the neuron is being depolarized and passes the threshold potential. C. After the peak depolarization of the action potential when it is rapidly repolarizing. D. During the undershoot phase when the neuron is slightly hyperpolarized relative to the resting potential. E. A positive feedback process is occurring at all the time points given.
The protection provided through transfer of antibodies from mother to fetus is an example of
A. active immunity. B. passive immunity. C. cell-mediated immunity. D. clonal selection. E. autoimmunity.
The primary tissue layers are formed in which of the
following stages? a. cleavage b. morula c. gastrula d. zygote e. blastula
The effect of population growth limiting factors
begin to become evident at about a. A. b. B. c. C. d. D. e. E.