1B - More Biological Molecules Flashcards Preview

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Flashcards in 1B - More Biological Molecules Deck (20):
1

Stages of DNA replication

1. DNA uncoils as DNA helicase breaks hydrogen binds 2. DNA polymerase joins complementary bases and free floating nucleotides. 3. Condensation reactions joins the nucleotides

2

Is DNA replication conservative of semi-conservative

semi-conservative

3

Define energy

Energy is the ability to work

4

Energy cannot....

be created or destroyed

5

Why do organisms need energy?

Metabolism, movement, active transport, maintenance of body temperature, productions of substances, repair and divisions of cells

6

How does ATP release energy?

The bond between the second and third phosphate is broken in a hydrolysis reaction which releases energy.

7

Synthesis of ATP

ADP + Phosphate ---------------> ATP Energy

8

Why does ATP allow enzyme controlled reactions to occur more readily

Lowers the activation energy

9

What is an inorganic ion

A charged molecule which doesn't contain carbon

10

What is the role of Fe2+

Binds haemoglobin to oxygen

11

What is the role of H+

Alters the pH of solutions

12

What is the role of Na+

Helps glucose and amino acids to cross cell membranes via co-transport. Also helps to maintain the concentration of water in cells

13

What is the role of PO43+

Attaches to other molecules to from phosphate groups

14

5 important properties of water

High specific heat capacity Large latent heat of vaporisation Solvent Strong cohesion Metabolite

15

High specific heat capacity

Cells can absorb lots of heat energy without changing temperature

16

Large latent heat of vaporisation

Can remove lots of energy when it evaporates without losing much water

17

Strong cohesion

Molecules are attracted to each other and so water flows well making it good for transportation

18

Solvent

Positive ends of water are attracted to the negative ions surrounding them in water molecules and so becoming dissolved. Good as substances can be transported easily around the body

19

Metabolite

Used in condensation and hydrolysis reactions. ATP release energy in a hydrolysis reaction.

20

Evidence DNA replication is semi-concervative