Two species of salamander have similar ranges, but one breeds from January to March, while the second one breeds from March to May. This is an example of
A. mechanical isolation.
B. temporal isolation.
C. habitat isolation.
D. behavioral isolation.
E. gametic isolation.
B. temporal isolation.
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Researchers who study molecular evolution often analyze DNA sequences using computer programs which identify homologous sequences
Indicate whether the statement is true or false
Which of the following describes the sequence of events that might occur in a long-day plant when a stem begins to produce flower parts?
A. CONSTANS (CO) protein, flowering gene (FT), messenger RNA, phloem transport to the meristem B. flowering gene (FT), CONSTANS (CO) protein, messenger RNA, phloem transport to the meristem C. messenger RNA, phloem transport to the meristem, CONSTANS (CO) protein, flowering gene (FT) D. messenger RNA, phloem transport to the meristem, CONSTANS (CO) protein, flowering gene (FT), phloem transport to the meristem E. phloem transport to the meristem, CONSTANS (CO) protein, flowering gene (FT), messenger RNA
The nitrogenous base that is in RNA but not in DNA is
A) thymine. B) thiamine. C) uracil. D) urea.
MDMA, the active ingredient in Ecstacy,
a. interferes with the removal of serotonin by transport proteins. b. causes an increased release in the neurotransmitter, dopamine. c. blocks the movement of epinephrine across the synaptic cleft. d. binds to endorphins making them unavailable. e. causes the rapid transport of acetylcholine across the synaptic cleft.