In studies of human genetics, usually a single individual brings the condition to the attention of a scientist or physician. When pedigrees are developed to illustrate transmission of the trait, what term is used to refer to this individual?
What will be an ideal response?
proband
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Neuroglial Schwann cells produce ____, which _____
a. neurotransmitters; are unnecessary for proper nervous signal conduction b. the myelin sheath; maintain the resting potential in neurons c. the myelin sheath; increases the speed of an action potential d. neurotransmitters; conduct signals across synapses e. meninges; provide neurotransmitters to neurons
Which of the following is true about base excision repair (BER) in bacteria?
A. BER is used to repair abasic sites created by hydrolysis or by DNA glycosylases. B. BER requires the action of a unique exinuclease activity to cleave 5' of the abasic site. C. At the nick created by the nuclease, Pol III can excise the damaged strand by nick translation. D. BER can be used to excise benzopyrene adducts. E. BER requires binding of the MutS protein to identify the abasic site.
A hydrogen bond is an attraction between a(n) ____ hydrogen atom and another hydrogen atom taking part in ____
a. covalently bonded; the same polar covalent bond b. ionically bonded; the same polar covalent bond c. covalently bonded; a separate polar covalent bond d. ionically bonded; a separate nonpolar covalent bond e. nonpolar covalently bonded; a separate nonpolar covalent bond
As energy passes through a food chain, approximately ____ percent is lost as it passes through each trophic level.
A. 10 B. 25 C. 50 D. 90