During an action potential, the membrane potential can reach as high as
a. +30 mV.
b. +40 mV.
c. +50 mV.
d. +60 mV.
e. +70 mV.
A
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Which of the following is a characteristic of flowering plants?
A. They produce seeds. B. They are called angiosperms. C. They develop flowers. D. They have leaves, roots, and stems. E. All of the choices are true.
One mole of a substance contains 6.02 x 1023 molecules. The atomic number of Li is 3 and the atomic mass is approximately 7. If you have three moles of Li, how many grams does it weigh?
A. 9 B. 21 C. 7 x 6.02 x 1023 D. 3 x 6.02 x 1023
Sperm use ____ for their energy source
a. fructose b. glucose c. ions d. semen e. prostate gland secretions
Another step in PCR requires small single-stranded DNA primers to anneal to a target sequence on denatured DNA. Two primers are used. Ideally these primers will have similar melting temperatures. The melting temperature is defined as the temperature at which 50% of the DNA is in the single-stranded form. Which of the following primers will have the highest melting temperature?
A. G G G A A A T T T C C C B. A A A A G G C C T T T T C. G G G G A A A T T T C C C C D. A A A A G G G C C C T T T T