What is the free-running nature of circadian rhythm analogous to?
a. a desktop computer
b. a digital telephone
c. an old-fashioned wrist watch
d. a modern calculator
Ans: c. an old-fashioned wrist watch
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You may have heard that monarch butterflies (and their caterpillars) are "poisonous" to many predators. What makes these insects so toxic?
A. Monarch caterpillars produce cardenolides in their digestive tracts. B. Monarch caterpillars use cardenolides from milkweed to synthesize toxins. C. Monarch caterpillars ingest milkweed latex which "chokes" their predators. D. Monarch caterpillars store cardenolides from milkweeds. E. Monarch caterpillars secrete latex from their bodies.
Which of the following happens during contraction of a skeletal muscle?
1.The myosin strands get shorter.
2.The concentration of Ca2+ in the cytosol of the muscle fiber decreases.
3.Troponin attaches to myosin.
4.The z lines get closer to each other, shortening the sarcomere.
Cell division of cocci in several planes produces a ________ arrangement.
A) streptococcal B) staphylococcal C) streptobacilli
Table: Transformations and processes in the water and carbon cycles
