What type of factors can trigger migration behavior in organisms?
a. seasonal weather changes
b. food availability
c. hormonal signals associated with maturation or reproduction
d. all of these
D
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Fibroblast cells are a good model system for studying muscle differentiation because
A. they are totipotent. B. they never differentiate into muscle cells in a normally developing animal. C. they can differentiate into muscle cells in a normally developing animal. D. they express a limited number of genes. E. they have a small genome.
Fertilization in humans occurs in the
a. ovary. b. uterus. c. vagina. d. oviduct. e. follicle
Which of the following is considered an accessory gland in the digestive system?
A. esophagus B. stomach C. cecum D. pharynx E. pancreas
Several hours after a meal, glucagon increases blood glucose levels by activating an enzyme that breaks down glycogen, which is stored primarily in the
A) liver. B) pancreas. C) small intestine. D) kidneys. E) heart.