A bond in which the positive end of one polar molecule is attracted to the negative end of another polar molecule is a(n)
A. covalent bond.
B. ionic bond.
C. electron bond.
D. hydrogen bond.
D. hydrogen bond.
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In humans, if non-disjunction led to an individual with a genotype of XO, that person would
A. be female because each cell lacks a Y chromosome. B. be male because each cell has only one X chromosome. C. display both male and female characteristics. D. not survive.
Mutations in bacterial porins can lead to antibiotic resistance typically by
A) closing the ?-helix of the porin. B) limiting the passage of nonpolar substances. C) blocking entry of the antibiotic. D) disrupting the voltage of the gated channel. E) all of the above
What describes placental mammalian embryos?
A. They are born immediately after fertilization. B. They develop inside a leathery shell. C. They complete development in a pouch. D. They hatch from an internal egg. E. They are totally dependent on the mother for complete development.
What are genetically modified organisms (GMOs) also called?
A) artificial crop plants B) artificially selected organisms C) transgenic organisms D) mutant crop plants