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

Biology & Microbiology

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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.

Biology & Microbiology

An EPSP is an example of a graded potential

____________________ Indicate whether the statement is true or false.

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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.

Biology & Microbiology

Sexual dimorphism has arisen as a result of ____

a. stabilizing selection b. heterozygote superiority c. kin selection d. sexual selection e. directional selection

Biology & Microbiology