2020 P2

Question 1

Explain why steroid hormones can rapidly enter a cell by passing through its cell surface membrane

Answer 1

Lipid soluble

Diffuse through phospholipid bilayers

Question 2

Why testosterone binds to a species AR

Answer 2

Specific tertiary structure

Complementary

Question 3

Two improvements of the calorimeter

Answer 3

Stirrer distributes heat energy

Insulation reduced loss of heat

Question 4

Most of light falling on producers is not used in photosynthesis

Answer 4

Light is reflected

Light is wrong wavelength

Question 5

Light dependent reactants that are required in light independent reaction

Answer 5

Reduced NADP

ATP

Question 6

Causes of genetic variation

Answer 6

Crossing over

Independent segregation

Question 7

Relationship between the two alleles that code for flower colour

Answer 7

Co-dominance

Question 8

Evaluate the effect on plant growth of adding different fertilisers to the soil

Answer 8

Potassium nitrate most effective
Chicken manure least effective
All fertilisers more effective to the control
No increase after 30g with ammonium nitrate
Chicken manure decreases after 45g
Fertilisers = nitrogen ounce for protein
No stats test
Only for spinach =

Question 9

What the scientists could do to ensure all water is remove

Answer 9

Weight and heat

Until mass is constant

Question 10

Calculate heat energy released in KJ per g of biomass

Answer 10

4. 18/1000 x 15.7 x 100 = 6.52

6. 52/2 = 3.28 KJg-1

Question 11

How many ells in culture after 24 hours

Answer 11

2^16 x 2000=

1.3 x10^8

Question 12

9% red flowers

Use hardy Weinberg to calculate % of pink flowered

Answer 12

42%

Question 13

genetic diagram Dwarf pink flowered x Tall white flowered

T= tall
t = dwarf 
Cr= red
Cw = white

Answer 13

parents = ttCrCw x TtCwCw

offspring = TtCrCw, TtCwCw, ttCrCw, ttCwCw

phenotype = tall pink, tall white, dwarf pink, dwarf white

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