What is a main function of the structure in the accompanying figure labeled "B"?
a. It controls cell shape.
b. It separates DNA during cell division.
c. It helps nerve cells lengthen.
d. It is found in hair.
e. It helps regulate DNA replication.
ANSWER: a
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Members of which phylum are called acorn worms?
a. Hemichordata b. Echinodermata c. Arthropoda d. Cnidaria
Healthy corals are brightly colored because they _____
A) secrete colorful pigments to attract mates B) host symbionts with colorful photosynthetic pigments C) build their skeletons from colorful minerals D) secrete colorful pigments to protect themselves from ultraviolet light
Clayton et al. discovered the following relationship between feather-louse size and the body mass of their corresponding bird hosts. What do the authors hypothesize from this relationship about the mechanism of cospeciation of doves and lice?
a. Lice are unlikely to switch to hosts that differ in body size from their original host. b. Lice will tend to shift to the larger host regardless of their own size. c. Larger lice are always better at holding onto their hosts. d. Smaller lice are always better at evading the preening attempts than large lice species.
What hormone is not produced by the anterior pituitary gland?
A. Prolactin B. Calcitonin C. Growth hormone D. Corticotropin-releasing hormone E. Luteinizing hormone