L1 - Energy, Elements, Atoms and Bonding

Question 1

Metabolism

Answer 1

The sum of all reactions in the body

Question 2

Anabolism

Answer 2

Building of molecules

Question 3

Catabolism

Answer 3

Breaking down of molecules

Question 4

Element

Answer 4

Substances that cannot be broken down to other molecules by chemical reactions

Question 5

Elements essential for life

Answer 5

25 in animals and 17 in plants (out of 92 naturally occuring)

Question 6

Elements for 96% of life:

Answer 6

C, N, H, O

Question 7

Most of remaining 4% of life:

Answer 7

P, S, Ca, K and traces of Fe and I

Question 8

Atom

Answer 8

Smallest unit of matter which still retains the properties of an element

Question 9

Atomic Number

Answer 9

Number of protons

Question 10

Atomic Mass

Answer 10

Sum of mass of components

Question 11

Isotopes

Answer 11

Same Mass number, different Proton number

Question 12

What can be used for dating

Answer 12

Carbon-14

Question 13

Compound

Answer 13

Substance with 2 or more elements in a fixed ratio

Question 14

Covalent bond

Answer 14

Sharing of electrons forming a very strong bond

Question 15

Hydrogen bond

Answer 15

Molecules with polar bond
Weak

Question 16

Ionic bond

Answer 16

Formed when two atoms with very different valence come together forming a crystal
Transfer of electrons
Very strong

Question 17

Van der Waal’s

Answer 17

Very weak, very short range, collectively strong
Interaction between electron clouds

Question 18

Protein folding

Answer 18

Several interactions hold proteins in correct shape for function