Campbell Reece 8th Edition Test bank chapter 2
Subject:
Biology [1]
Tags:
Chemistry [2]
Chemical bonding [3]
Charge carriers [7]
Chemical bond [8]
Valence electron [9]
electron [10]
Hydrogen bond [12]
Covalent bond [13]
Technology [14]
Chapter 2 The Chemical Context of Life 1) About 25 of the 92 natural elements are known to be essential to life. Which four of these 25 elements make up approximately 96% of living matter?? A) carbon, sodium, chlorine, nitrogen? B) carbon, sulfur, phosphorus, hydrogen? C) oxygen, hydrogen, calcium, sodium? D) carbon, hydrogen, nitrogen, oxygen? E) carbon, oxygen, sulfur, calcium? Answer: ?D? Topic: ?Concept 2.1? Skill: ?Knowledge/Comprehension 2) Trace elements are those required by an organism in only minute quantities. Which of the following is a trace element that is required by humans and other vertebrates?? A) nitrogen? B) calcium? C) iodine? D) sodium? E) phosphorus? Answer: ?C? Topic: ?Concept 2.1? Skill: ?Knowledge/Comprehension