The two most important regulatory systems for the maintenance of homeostasis are ____
a. circulatory and nervous systems
b. endocrine and circulatory systems
c. lymphatic and circulatory systems
d. nervous and endocrine systems
e. lymphatic and circulatory systems
ANSWER: d
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Two-thirds of terrestrial environments support growth of termites
Indicate whether the statement is true or false.
In the correct order from smallest to largest, list the levels of organization present in most animals.
What will be an ideal response?
In Drosophila, a gynandromorph, which is composed of equal parts of male and female tissue, results from
A) an XX female losing one X chromosome during the first mitotic division after fertilization. B) an egg carrying an X chromosome fertilized by a Y-carrying sperm. C) a normal egg fertilized by both an X-carrying sperm and a Y-carrying sperm. D) the fusion of a female embryo with a male embryo.
In a muscle contraction, what specifically is the
role of calcium?
a. it causes the hydrolysis of ATP b. it connects actin with myosin to form a cross-bridge c. it causes the uncovering of the myosin binding site on actin d. it catalyzes the formation of ATP from ADP and Pi e. it causes the release of Pi from the myosin head