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Year 1 Biology > 1B - More Biological Molecules > Flashcards

1B - More Biological Molecules Flashcards

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1
Q

Stages of DNA replication

A
  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
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2
Q

Is DNA replication conservative of semi-conservative

A

semi-conservative

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3
Q

Define energy

A

Energy is the ability to work

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4
Q

Energy cannot….

A

be created or destroyed

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5
Q

Why do organisms need energy?

A

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

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6
Q

How does ATP release energy?

A

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

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7
Q

Synthesis of ATP

A

ADP + Phosphate —————> ATP Energy

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8
Q

Why does ATP allow enzyme controlled reactions to occur more readily

A

Lowers the activation energy

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9
Q

What is an inorganic ion

A

A charged molecule which doesn’t contain carbon

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10
Q

What is the role of Fe2+

A

Binds haemoglobin to oxygen

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11
Q

What is the role of H+

A

Alters the pH of solutions

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12
Q

What is the role of Na+

A

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

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13
Q

What is the role of PO43+

A

Attaches to other molecules to from phosphate groups

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14
Q

5 important properties of water

A

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

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15
Q

High specific heat capacity

A

Cells can absorb lots of heat energy without changing temperature

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16
Q

Large latent heat of vaporisation

A

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

17
Q

Strong cohesion

A

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

18
Q

Solvent

A

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
Q

Metabolite

A

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

20
Q

Evidence DNA replication is semi-concervative

A

Year 1 Biology (12 decks)

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