Within a double-stranded DNA molecule, adenine forms hydrogen bonds with thymine and cytosine forms hydrogen bonds with guanine. This arrangement _____
A) allows variable width of the double helix
B) permits complementary base pairing
C) determines the tertiary structure of a DNA molecule
D) determines the type of protein produced
B
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Ethylene oxide is
A. used as an antiseptic against anaerobes. B. sporicidal. C. only effective with high heat. D. a halogen. E. the active agent in household bleach.
Scientists have discovered gene products, including the hormone ELH, that control all components of egg-laying behavior in Aplysia slugs. This discovery confirms that
A. the egg-laying behavior has absolutely no nervous system involvement. B. genes can control endocrine gland secretions that control behavior. C. this slug could avoid being eaten by garter snakes. D. genes only influence physiology and structure but not behavior. E. the egg-laying behavior is innate or hardwired into the slug's brain.
Select the correct statement regarding the human female reproductive system.
A. The Fallopian tubes transport ova from the ovary to the uterus. B. The uterus is lined with granulosa cells. C. The ovarian fimbria is the functional unit of the ovary. D. The granulosa cells secrete testosterone, which triggers menarche. E. The cervix contains corpora cavernosa tissue, which is a type of erectile tissue.
The separation of nucleic acids in a DGGE gel is based on
a. GC content. b. melting profiles. c. taxonomic identity. d. all of the above.