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Flashcards in AOS 1 Deck (24)
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1

What are 5 pieces of evidence supporting the bacterial origins of chloroplasts and mitochondria?

1. They have their own DNA, which is circular.
2. They have their own ribosomes and produce their own proteins.
3. They reproduce by binary fission independently of cell cycle.
4. They are bound by a double plasma-membrane.
5. They have porin transport proteins only found in prokaryotic plasma membranes.

2

How are glucose/carbohydrates stored in plant cells? (2)

As starch in plant cell amyloplasts.
As cellulose in plant cell wall.

3

How are glucose/carbohydrates stored in animal cells?

As glycogen in liver and muscle cells.

4

What bonds join amino acids, what reaction, what molecule is produced?

Peptide bonds join amino acids in a condensation reaction (produces water molecule) which produces a polypeptide (protein).

5

Describe the amino acid structure.

Amino group (H2N), Carbon atom, Carboxyl group (COOH), Hydrogen atom, R chain

6

Describe the four protein orders and bonds.

Primary: linear sequence of amino acids (peptide bonds).
Secondary: folding to alpha-helix or beta-pleated (hydrogen bond).
Tertiary: irregular folding (hydrogen and ionic bonds).
Quaternary: 2 or more tertiary chains.

7

List 5 factors that affect diffusion

Size of molecule, polarity, charge, amount, concentration gradient.

8

List 5 functions of the plasma membrane

Protects cell
Contains contents
Cell identity
Communication
Controls movement of substances

9

Describe the structure of a phospholipid

Polar head: glycerol backbone & phosphate group
Non-polar tails: 2x fatty acid chains (one sat, one un-sat)

10

Identify RNA/DNA in a nucleotide

(bottom of pentagon)
2x OH groups = RNA
1x OH 1x H = DNA

11

What is the difference between the two types of inhibitors?

Competitive: competes for active site
Non-competitive: alters active site shape

12

What is a coenzyme?

An organic (molecule) that allows enzyme to function, usually by carrying an electron/ion (eg. ATP/NADPH).

13

What is a cofactor?

Inorganic (ion) that allows enzyme to function.

14

What is activation energy?

The energy required to break the bonds in the reactants of a reaction so the reaction can begin.

15

How do enzymes affect activation energy?

They lower Ea

16

Describe a condensation reaction

A reaction that releases water molecules (eg. polymerisation, anabolic (absorbs energy) (THINK PHOTOSYNTHESIS)

17

Describe a hydrolysis reaction

Reaction that requires water, catabolic (releases energy) (THINK CELLULAR RESPIRATION)

18

Describe the overall equation for photosynthesis

CO2 + H2O -> (Chlorophyll & light) O2 & C6H12O6

19

Describe the first stage of photosynthesis

Light dependent
In thylakoid membrane of chloroplast
Chlorophyll absorbs light energy (enzymes)
H2O is split by light into H+ and O2, forms ATP
H+ joins to NADPH
Oxygen is waste product

20

Describe the second stage of photosynthesis

Light independent/Calvin cycle
In stroma of chloroplast (liquid)
NADPH and ATP and CO2 are joined together by RuBisCo to form glucose

21

What is the point where the rate of ps and res are equal?

Compensation point (no net increase/decrease of CO2)

22

Describe the first stage of respiration

Glycolysis
In cytoplasm
Anaerobic
glucose split into pyruvate and 2ATP and 2NADH

23

How much ATP is produced from respiration

36 or 38

24

Describe the second stage of respiration

Krebs cycle
In matrix of mitochondria (fluid)
Pyruvate is oxidised to Acetyl CoA
Acetyl CoA is split into 6CO2, 2ATP, 6NADH, 2FADH2