Chapter 3

Question 1

Organic compounds

Answer 1

Carbon-containing compounds present in living matter

Question 2

Metabolism

Answer 2

Total of all chemical reactions occurring in a living thing

Question 3

Catabolism

Answer 3

energy-releasing reactions
in an organism that result 
in the breakdown of 
complex molecules to 
more simple ones,

Question 4

Anabolism

Answer 4

Energy-requiring reactions
that result in the
production of complex
substances from more
simple ones

Question 5

Cohesion

Answer 5

Cohesion the tendency of molecules of the same kind to stick together

Question 6

Adhesion

Answer 6

Surface tension

Question 7

Hydrogen bonds

Answer 7

Weak non-covalent bonds that form between complementary nucleotides in different DNA strands; hydrogen bonds are responsible for stabilising the structure of the DNA double helix

Question 8

Covalent bonds

Answer 8

Type of bond between an oxygen atom and each of the two hydrogen atoms in a water molecule; electrons are shared between the atoms involved in the bonding

Question 9

Hydrophillic

Answer 9

Refers to substances
that dissolve easily in
water; also called polar

Question 10

Hydrophobic

Answer 10

Hydrophobic refers to substances that tend to be insoluble in water; also called non-polar

Question 11

Polar

Answer 11

Polar refers to substances that dissolve easily in water; also called hydrophilic

Question 12

Non-polar

Answer 12

Non-polar refers to substances that tend to be insoluble in water; also called hydrophobic