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Biology Triple Science > Paper 1 > Flashcards

Paper 1 Flashcards

1
Q

What is a cell membrane wall

A

A semi permeable

Which allows what goes in and out of the cell

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2
Q

What is a plasmid

A

A loop of DNA

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3
Q

What is a cell wall made up of

A

Cellulose

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4
Q

How does bacteria divide

A

Thought binary fusion

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5
Q

How many chromosomes does a human cell have

A

46

Diploid cell

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6
Q

How much chromosomes does a gamete have

A

23

Haploid cell

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7
Q

Explain Mitosis

A

Nucleus dissolves and genetic materials is duplicated

2 set of chromosomes move to different sides

Organelles duplicated

Cell divides producing 2 genetically identical diploid cell

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8
Q

What is Osmosis

A

The diffusion of water across a semi permeable to balance the concentration of solution inside and outside a cell

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9
Q

How can movements of particles rate can be increased

A

The difference in concentrations

Surface area

Temperature

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10
Q

What is active transport

A

Movement of particles through a membrane via CARRIER PROTEINS

Require energy

Move them against the concentration gradient

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11
Q

What enzyme does saliva contain

A

Amylase

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12
Q

What does bile do

A

Emulsifies LIPIDS to form droplets

Increases surface area

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13
Q

What does the pancreas release and what does it do

A

Releases Amylase and all enzymes

Breaks down starch into glucose

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14
Q

Where is water absorbed in the body

A

Large intestine

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15
Q

Where are nutrients absorbed

A

Small intestine

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16
Q

What are enzymes

A

Special proteins that act as biological catalyst

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17
Q

Explain Enzyme practical

A

Mix amylase with starch and start timer

Remove a few drops from mixture every 10 seances and add to iodine

Record time taken for no starch to be detected

18
Q

Food Test

Starch

A

Turns Iodine from orange to black

19
Q

Food test

Sugars

A

Turn Benedicts from blue to orange

Must be heated

20
Q

Food Test

Protein

A

Turns Biuret from Blue to Purple

21
Q

Food Test

Lipids

A

Sudan 3

Red fat layer formed

22
Q

What is double circulatory system

A

Blood enters heart twice every time it is pumped round body

23
Q

What does the Pulmonary artery do

A

Takes un oxygenated blood into the lungs

24
Q

What is the pulmonary vein

A

Takes oxygenated blood from the lungs into the heart

25
Q

What is the aorta

A

Heart to body

26
Q

Why will the left side of the heart have thicker walls

A

Need higher pressure needed to pump blood to the body

27
Q

What is coronary heart disease

A

When the artery supplying the blood to the heart becomes blocked

28
Q

Features of arteries

A

Thick walls

Wide lumen

29
Q

Features of a vein

A

Thin walls

Wide lumen

Has valve

30
Q

What are stents and what do they do

A

Help to open vessel

For CVD

31
Q

What are statins and what do they do

A

Drugs

Reduce fatty deposits

32
Q

What is carcinogens

A

Anything that increases the rate of cancer occurring

33
Q

What is the xylem

A

Continuous tubes that carry water and dissolved Mineral ions upwards

Transpiration

34
Q

What is the Phloem

A

Tubes of cells that carry sugars

Translocation

Bi Directional

35
Q

What are nitrates needed for and deficiency

A

Nitrates are needed for protein synthesis

Deficiency:Stunted growth

36
Q

What are magnesium needed for and deficiency

A

Chlorosis occurs

Deficiency:Yellow leaves and stunted growth

37
Q

What is the waxy cuticle

A

Waterproof to stop water loss from top of leaf

38
Q

What is the upper epidermis

A

Transparent to let light through

39
Q

What is the spongey mesophyll

A

Gaps to facilitate gas exchange

40
Q

How do virus reproduce

A

By inserting genes into cells which causes them to produce more copies

41
Q

What are lymphocytes

A

A type of white blood cell which produces antitoxins

42
Q

Explain pregnancy test to be positive

A

1.Urine travels up the reaction zone

2.HCG hormone will react to the mobile antibodies in the reaction zone

3.HCG hormone will move up and bind to the immobile antibodies in the result window

4.Any antibodies that do not bind to the HCG

5.will bind to the immobile antibodies in the control window

6.Blue die will appear in result and control window

Biology Triple Science (7 decks)

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