DNA’s two major functions are to ____________________ and to carry the ____________________ information for
proteins and RNA molecules Fill in the blank(s) with the appropriate word(s).
replicate; genetic
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Which of the following statements about hydrostatic skeletons is false?
A. Longitudinal muscle contractions increase the length of the body cavity. B. Hydrostatic skeletons are found in many vascular plants and almost all multicellular animals. C. Movement is produced by muscles that exert pressure against a fluid-filled cavity. D. Intervertebral discs and cartilage are examples of hydrostatic elements in the vertebrate skeletal system. E. Circular and longitudinal muscles function as antagonists.
Salmon are well known for their ability, after growing to maturity in the ocean, to find their way back to the streams where they were born in order to breed. For this kind of navigation, they likely:
A. use magnetotaxis only. B. use map information only. C. rely on kinesis only. D. use a variety of environmental cues. E. use only a combination of magnetotaxis and kinesis.
The uncharged component of the atom is the
A. electron. B. proton. C. neutron. D. muon.
Which of the following is the most error-prone of the repair mechanisms?
A. Photoreactivation B. SOS repair C. Recombination repair D. Postreplication repair