The simplest sensory receptors are __________ that respond to mechanical distortion, changes in temperature, or specific chemicals.
A. nociceptors
B. free nerve endings
C. gated channels
D. photoreceptors
E. ganglia
B. free nerve endings
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For a gene with complete dominance, the recessive allele has no effect on the phenotype of a heterozygote
Indicate whether the statement is true or false
Which hormone stimulates both leaf abscission and fruit ripening?
a. abscisic acid b. auxin c. cytokinin d. ethylene e. gibberellin
The tropical diseases such as African sleeping sickness, Chagas disease, and leishmaniasis are caused by
A. trypanosomes. B. phytomastigotes. C. sporozoans. D. foraminifera. E. oomycetes.
In snapdragons, heterozygous plants have pink flowers, one of the homozygous conditions produces red flowers, and the other homozygous condition produces white flowers. When a parent plant with red flowers is crossed with a parent plant with white flowers, what percentage of the F1 offspring are expected to have pink flowers?
a) 75% b) 25% c) 0% d) 100% e) 50%