Topic 1 Molecules and Macromolecules

Amino Acids are the building blocks of what macromolecule?

• DNA

• Proteins

• Cellulose

• Chromatin

Atomic number (Z) is :

• Number of protons minus the number of electrons

• The number of protons = number electrons

• Number of protons plus neutrons

• Total number electrons, protons and neutrons

When outershells are entirely filled, atoms are ....

• Unstable

• Stable

The most common elements in living organisms are:

• Na, Ca, C, O

• N, O Ca, S

• C, H, N, O

• C, H, Na, O

Which one is not an example of INTERmlecular forces

• Hydrogen bond

• Hydrophobic interaction

• Van der Waals interaction

• Covalent bonding

A covalent bond is formed when.....

• Electrons are passed from one atom to another

• Electrons form a delocalised swarm around atoms

• Electrons are shared between 2 atoms

• Electrons are lost from both atoms

How many electrons share a triple bond?

• 2

• 4

• 6

• 8

The Ionic bond is formed through electrostatic attraction.

• TRUE

• FALSE

Water intramolecular forces are covalent bonds between O and H, what bond acts BETWEEN water molecules?

• Ionic

• Hydrogen

• Metal

• Van de Waals

Hydrophobic interactions are important in the formation of which organelle?

• Nucleus

• Chromatin

• Biological membranes