Author Question: How many electrons are there in the valence shell of a nitrogen atom? A) 0 B) 2 C) 3 D) 5 E) ... (Read 109 times)

tiffannnnyyyyyy · **on:** Aug 27, 2018

How many electrons are there in the valence shell of a nitrogen atom?

A) 0
B) 2
C) 3
D) 5
E) 7

Question 2

Explain the term specificity as it applies to enzyme activity.

What will be an ideal response?

Cheesycrackers · **Reply #1 on:** Aug 27, 2018

Answer to Question 1

D

Answer to Question 2

Specificity describes the degree of restriction of the activity of an enzyme. Most enzymes only catalyze a specific type of reaction, as evidenced by the broad terms transferase, oxidoreductase, etc. However, some enzymes may act on only one specific substrate molecule. For example, one hydrolase may act on any amide linkage in a peptide, while another hydrolase will only act on the linkage between a specific pair of amino acids. The precise shape of the active site is often the determining factor in specificity. One analogy for describing this is using the specific key for your office versus using a master key that opens your office and many others.