When some animals mature, they then migrate long distances to their breeding grounds or to escape
harsh weather. A signal for this type of behavior is often:a.
a conditioned stimulus.
b. day length.
c. negative reinforcement.
d. a sign stimulus.
e. territoriality.
B
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Hormones are chemical substances produced in one organ that are released into the bloodstream and affect the function of a target organ. For the target organ to respond to a particular hormone, it must _____
A) modify its plasma membrane to alter the hormone entering the cytoplasm B) be from the same cell type as the organ that produced the hormone C) experience an imbalance that disrupts its normal function D) have receptors that recognize and bind the hormone molecule
At the point in the cell cycle when mitosis begins
A) DNA replication begins. B) each chromosome consists of two identical chromatids joined at the centromere. C) the number of chromosomes is reduced to half. D) the cell enters a dormant phase.
Which of the following is an adaptation of black-tailed prairie dogs?
a. modified digestive tracts to easily digest seeds and leaves of grasses b. transition to a carnivore lifestyle c. movement towards above ground living d. hibernation throughout the spring e. movement towards living in small social groups
Much of the world's coal reserves were formed from the buried remains of the dominant plants of the Carboniferous period. What were the dominant plants of the period?
a. gymnosperms and angiosperms b. angiosperms only c. gymnosperms only d. seedless vascular plants