Biology Jeopardy Ch 2 Review Section 1Section 2Section 3Section 4LabsTerms

A weak attraction between polar molecules is called a ____ bond. hydrogen 2

Atoms share electrons in a ____ bond. covalent 3

True or False: Covalent bonds form when two or more atoms share electrons. True 4

A nucleotide has four parts? True or False False – they have 3 parts 5

A substance that is composed of only one type of atom is called a(n) Element 6

Acidic solutions have a pH that is less than 7. 7

Hydrogen ions, H+, react with hydroxide ions, OH-, to form Water 8

When placed in the same container, oil and water do not mix because water is polar and oil is nonpolar. 9

Water is important to life because it? surrounds all cells, is found inside cells, and influences the shape of the cell membrane. 10

_____ allows a needle to float on the water. Surface tension 11

A molecule shaped like a spiral staircase (double helix) is typical of deoxyribonucleic acid. 12

ATP (adenosine triphosphate) stores energy for cells to use in the bonds between its phosphates. 13

DNA stores heredity information. 14

The two types of nucleic acids are DNA and RNA. 15

The shape of a protein is primarily determined by the type and sequence of its amino acids. 16

Most enzymes are? proteins 17

Energy needed for metabolism comes from? Foods – lipids, proteins, carbohydrates 18

____ are biological catalysts. enzymes 19

The molecule on which an enzyme acts is called a(n) substrate. 20

Without enzymes, the chemical reactions in your body would occur too slow to support life processes. 21

Benedict’s solution is used to detect the presence of?. reducing sugars, such as glucose. 22

Lugol’s iodine solution is used to detect the presence of starch. 23

Amylase is a digestive enzyme that breaks down starch into cellulose. 24

Due to the polarity of water, compounds that dissolve best in water contain polar bonds. 25

Many laundry detergents contain _____, which make removal of stains easier. enzymes 26

made of only one type of atom element 27

attraction between different substances adhesion 28

attraction between molecules of the same substance cohesion 29

evenly distributed mixture solution 30

a substance made of the joined atoms of two or more different elements compound 31