Stimulation of a sensory receptor causes a receptor potential. Similar to action potentials, receptor potentials do not vary in magnitude, and are ‘all or nothing.’
1.True
2.False
2
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The anatomical orientation or arrangement of the nervous system of a sea star
a. contains a central control organ with interconnecting neurons. b. produces a signal that intensifies as it radiates from its point of origin. c. cannot coordinate movement of the arms. d. allows the organism to respond to stimuli approaching from any direction. e. sends electrical signals in only one direction.
Different healthy individuals exhibit widely varying responses to the same microorganism due to ______ differences that influence their first, second, and/or third line immune defenses
Fill in the blank(s) with the appropriate word(s).
In species that are capable of both sexual and asexual reproduction, under which of the following conditions is sexual reproduction more likely to occur?
A. when males and females find each other B. when conditions for survival are favorable C. when conditions for survival are unfavorable D. cannot be determined: the conditions favor sexual over asexual remain a complete mystery.
All the alleles present in all individuals in a species are referred to as the ____ of that species
A. gene pool B. allele frequency C. genotype frequency D. genotype E. phenotype