Sulfur has an atomic number of 16 and a mass number of 32. How many electrons are needed to complete the valence shell of a sulfur atom?

A) 0
B) 1
C) 2
D) 6
E) 8


Answer: D) 6

Biology & Microbiology

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The Ngorongoro Conservation Area is an example of ____

a. conservation through preservation, with people completely excluded b. conservation through preservation, with people allowed only as temporary visitors c. mixed use conservation, with some human residents and livestock grazing d. mixed use conservation, with no human residents and limited livestock grazing e. conservation through restoration, with efforts to remove contaminants underway

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Which of these is in the correct order, from oldest to most recent?

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Which molecule is made in the nucleus but exits to function in the cytoplasm?

A) gene B) chromosome C) protein D) mRNA

Biology & Microbiology