In the nucleotide sequence ACTGG, what does
C stand for?
a. cysteine
b. cytotic
c. cytosine
d. chargaff
e. cystomitosine
C
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Botulinum toxin has been used for all of the following purposes except
a. for cosmetic purposes, to treat “dynamic wrinkles.” b. to treat facial and eyelid spasms. c. for OCD and autism. d. to treat dystonias, prolonged muscle contractions. e. for certain types of cerebral palsy.
Nutritionally, saturated triacylglycerols are considered to be less healthful than unsaturated triacylglycerols. What is the difference between them?
A. Saturated triacylglycerols are fats; unsaturated triacylglycerols are carbohydrates. B. Saturated triacylglycerols have more hydrogen atoms than unsaturated triacylglycerols. C. Saturated triacylglycerols have more double bonds than unsaturated triacylglycerols. D. Saturated triacylglycerols are liquid at room temperature. E. All of the above.
Homo rudolfensis was discovered by
A. Raymond Dart. B. Richard Leakey. C. Charles Darwin. D. Donald Johanson.
Which of the following statements correctly describes why a series of closely spaced action potentials causes a sustained contraction rather than a series of closely spaced twitches?
A. Release of Ca2+ from the sarcoplasmic reticulum through channels is slow compared to the uptake of Ca2+ into the SR via ATP-dependent pumps, resulting in Ca2+ slowly trickling into the sarcomeres between closely spaced action potentials. B. Ca2+ ions are released quickly from troponin, keeping the Ca2+ concentration in the cytosol high between closely spaced action potentials. C. When a series of action potentials is closely spaced, there is not sufficient time for Ca2+ uptake into the sarcoplasmic reticulum between action potentials, and Ca2+ remains bound to troponin throughout the series. D. Fewer Ca2+ ions are released from the sarcoplasmic reticulum as a result of several closely spaced action potentials than as a result of a single action potential.