If an element has an atomic number of 6 and a mass number of 14, how many neutrons does it have?
A. 6
B. 8
C. 14
D. 7
E. impossible to determine
Answer: B
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Why are viroids resistant to nucleases?
A. Having a circular RNA "genome," they are resistant to the digestion of most exonucleases (that nibble/digest the free ends of RNA or DNA). B. Having a circular RNA "genome," with no protein shell, they are resistant to the protein-degrading activities of nucleases. C. Nucleases will only digest DNA, not RNA-so viroids are protected. D. Viroids have only been identified in plants. Plant nucleases cannot digest RNA.
Sexual dimorphism has arisen as a result of ____
a. stabilizing selection b. heterozygote superiority c. kin selection d. sexual selection e. directional selection
An EPSP is an example of a graded potential
____________________ Indicate whether the statement is true or false.
ATP is best described as
A. an electron carrier. B. the energy molecule of cells. C. an enzyme. D. a double helix. E. All of these choices are correct.