Chapter 2- Chemical Aspects of Life

Question 1

the smallest unit of an element

Answer 1

atom

Question 2

a group of organic compounds composed of C, H, and O usually in a 1:2:1 ratio; mono- di- and polysaccharides

Answer 2

carbohydrate

Question 3

a substance formed of two or more elements combined in a fixed ratio

Answer 3

chemical compound

Question 4

a substance that cannot be broken down into simpler substances by chemical means

Answer 4

chemical element

Question 5

the breakdown of complex molecules into simpler molecules

Answer 5

decomposition reaction

Question 6

a protein that catalyzes chemical reactions

Answer 6

enzymes

Question 7

an atom of an element having the same number of protons and electrons but a different number of neutrons than most atoms of the element

Answer 7

isotope

Question 8

a group of organic compounds containing fats

Answer 8

lipids

Question 9

the smallest unit of a compound, composed of two or more atoms chemically combined

Answer 9

molecule

Question 10

a simple sugar, a carbohydrate molecule composed of a single saccharide unit

Answer 10

monosaccharide

Question 11

a complex organic molecule composed of nucleotides

Answer 11

nucleic acid

Question 12

a group of nitrogen- containing organic compounds formed of amino acids

Answer 12

protein

Question 13

formation of a molecule by combining atoms or simpler molecules

Answer 13

synthesis reaction