During a relative refractory period:a
an axon can transmit impulses comparable to a resting neuron.
b. an axon cannot transmit an action potential at all.
c. an axon can transmit impulses, but the threshold level is higher.
d. all voltage-activated sodium channels are inactivated.
e. neurons can only transmit several impulses per second.
C
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Which process involves antibodies covering surface receptors on a virus or toxin molecule, thereby disrupting their activity?
A. Neutralization B. Opsonization C. Complement fixation D. Agglutination E. Anamnestic response
In human females, one of the sex chromosomes is switched off during early development in a
phenomenon called a. karyotyping. b. X inactivation. c. X linkage. d. crossing over. e. SRY activation.
_________ and __________suggested that RNA may have been the first molecule to encode genetic information.
Fill in the blank(s) with the appropriate word(s).
Production of sperm in males by the process of meiosis and maturation.
What will be an ideal response?