Biology Paper 1 Flashcards
(27 cards)
D
C
State and explain how one property of region A contributes to the stability of the plasma membrane? (2)
-Hydrophobic region (1)
-Helps create a bilayer between two aquous regions (1)
Outline the role of memnbranes WITHIN cells? (2)
-Compartmentalisation (1)
-Site of photophosphorylation (1)
-Attachment sites for enzymes (1)
Give three properties of cellulose that makes it suitable as the basis of plant cell walls? (3)
-High TENSILE strength (1)
-Inert/unreactive (1)
-Insoluble (1)
-Flexible (1)
Identify tissues W,X and Y? (3)
W- hepatic/liver
X- pancreas
Y- skeletal muscle
A
Explain why gibberelin is classed as a plant hormone? (3 marks)
-Chemical messenger (1)
-Produced in one part of the plant but has an effect at another part (1)
-Causes an effect in plant cells (1)
-Long-lasting effect (1)
-Wide spread effect (1)
What is the test for for starch and sugars, the colour of reagant and a positive and negative result?
Starch: Iodine, orange-brown, blue-black, orange-brown
Sugars: Benedicts, light blue, green->brick red, light blue
What is the test for lipids and proteins, colour of reagant and a positive and negative result?
Lipid: Ethanol, colourless, cloudy emulsion, colourless
Proteins: Buiret, blue, purple, blue
Suggest the mechanism by which carbon dioxide could reduce the affinity for oxygen of haemoglobin?
-CO2 forms carbonic acid(1) which dissociates into H+(1)
-Haemoglobin acts as buffer absorbing excess H+(1)
-Lowers PH causing a change in tertiary structure of haemoglobin (1)
Explain why visible blood vessels are likely to be veins? (3 marks)
-Veins contain valves so will buldge (varicose veins) (1)
-Large lumen due to slow moving blood (1)
-Veins are found closer to the skin than arteries (1)
Suggest why anabolic steroids are effective when applied to the surface of the skin? (2 marks)
-Skin has a large S/A for absorption(1)
-Skin has a network of cappilaries (1)
-Steroids are lipid soluble so can pass through phospholipid bilayer (1)
-Muscles are close to skin so short diffusion distance (1)
Use fig 20 to explain what is meant by the term conjugated protein? (3 marks)
-Contains a non-protein prosthetic group (2)
-Prosthetic group is iron ion (1)
-Attached by covalent bonds/ionic interactions/hydrogen bonds (1)
Identify the name and region of the gland that secretes adrenaline? (1)
Region B and Adrenal medulla
What is the heart problem shown by this ECG
Tachycardia
What heart problem is shown by this ECG?
Bradycardia
What heart problem is shown by this ECG?
Ectopic heat beat
What heart problem is shown by this ECG?
Fibrillation
Suggest why reduced heart rate is seen in people who are very aerobically fit?
-Increased thickness/strength of heart muscle
Give two examples of commercial uses of auxin? (2 marks)
-Promotes fruit ripening (1)
-Used in rooting powder/ micropropogation (1)
-Prevents abscission (1)
Label 1,2 and 3 of this ATP molecule?
1-Adenine
2-Ribose
3-Phosphate groups
A teacher told his students that the human body makes the equivalent of its own mass in ATP every day
Explain why, at the end of the day, only a small proportion of the students mass was ATP? (2 marks)
-ATP is brocken down to ADP (1)
-ATP is used for metabolic processes (1)
-ATP is constantly recycled
-ATP is not stored long term
The solvent used for the separation was non-polar.
Identify the spot corrosponding to the least polar pigment. Give a reason for your choice? (2)
-Spot 5 (1)
-Most soluble in the mobile phase (1)
