Which type of chemical bonds are found within a water molecule?
a. hydrogen
b. ionic
c. polar covalent
d. nonpolar covalent
e. triple
ANSWER: c
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You digest DNA from the frog Xenopus laevis with the enzyme NotI that produces sticky DNA ends. You can ligate your DNA to:
_____ blunt AluI ends from Xenopus laevis. _____ sticky NotI ends from Xenopus laevis. _____ blunt AluI ends from bacteria. _____ sticky NotI ends from bacteria. _____ sticky EcoRI ends from Xenopus laevis. _____ sticky EcoRI ends from bacteria.
To produce an allergic reaction in Type I hypersensitivity, the antigen
A. must bind to mast cells. B. must bind to free IgE molecules. C. must just bind to IgE on mast cells. D. must bind to two neighboring IgE molecules on mast cells crosslinking them.
Hydrogen forces have high attractive forces that allow water to have a high:
a. strength. b. solubility. c. freezing point. d. boiling point. e. rate of evaporation.
Which of the following statements is FALSE?
A) Fungi produce sexual spores. B) Fungi produce asexual spores. C) Fungal spores are used in identification of fungi. D) Fungal spores are highly resistant to heat and chemical agents. E) Fungal spores are for asexual or sexual reproduction.