Bio Mock

Question 1

Describe the bonds in maltose

Answer 1

Alpha glucose 1-4 glycosidic bond
Formed by condensation reaction

Question 2

Maltotriose gap fill

Answer 2

2H20
Because 2^2 glycosidic bonds present

Question 3

Suggest why Maltase can break down malotriose

Answer 3

Maltase breaks down 1-4 glycosidic bonds which present in malotriose

Therefore Maltase able to break it down as it has complimentary active site shape to malotriose

Question 4

Monomer polymer glysocidic bond present

For Amino acid, amylopectin, glucose, sucrose

Answer 4

Amino acid - monomer

Amylopectin - polymer, glycosidic bond

Glucose - monomer

Sucrose - glycosidic bond

Question 5

How did the chromatography support statement that GP was produced first

Answer 5

At 1 second GP already present therefore showing first produced

Question 6

How does the chromatography support TP converted to GP

Answer 6

10s TP small while RuBP and sugar phosphates had high conc

30s TP higher conc compared to RuBP, GP and other compounds

This is because TP present at both 5 and 30 seconds whereas RuBP and sugar did not change in size but the TP did as it was acting as an intermediate to form those 2 which is why it was formed after GP

Question 7

Use the figure to suggest what happened to TP

Answer 7

Amino acids present at 30s which suggests TP had been converted to (specific amino acids like glycerine or serine)

Question 8

Using the figure in the previous question, explain why certain plants can live in enclosed areas, such as terrariums for several weeks or months?

Answer 8

During the night with low light intensity, respiration happens where CO2 is produced as well as H20

During the daytime, when light intensity is high, photosynthesis happens where CO2 and H20 from respiration are used in ATP production and O2 produced from photosynthesis used in respiration

Glass allows all wavelengths of light to pass through allowing for light dependent stage to take place

Question 9

Name a banned substance in sport

Answer 9

Anabolic steroids

Question 10

Why is furosemide able to hide presence of other performance enhancing drugs

Answer 10

Dilutes urine which makes positive detection of drugs like anabolic steroids less likely

)Interferes with retention time in GC?)

Question 11

Describe one advantage of using a urine sample over a biopsy sample

Answer 11

Quicker to complete the test

Non-invasive

Question 12

Furosemide can increase selective reabsorbtion of water, how does this help with weight loss?

Answer 12

Less water selectively re absorbed so more water removed from the body

Question 13

Explain why sperm cells have a high concentration of hydrogen peroxide

Answer 13

Large amounts of mitochondria because they are constantly moving so mitochondria produce superoxide ions which broken down to H202 by SOD

(H202 potentially needed to break apart outer layer of egg so it can be penetrated)

Question 14

Enzyme catalase breaks down hydrogen peroxide

Why must this happen quickly

Answer 14

Highly reactive so it can react with other molecules and cause unwanted side products

Could disrupt phospholipid bilayer

Question 15

Suggest how H202 damages the plasma membrane

Answer 15

H202 highly reactive and oxidises phospholipids or proteins in the plasma membrane. This disrupts its structure and increases permeability

Question 16

Why does this plant have higher percentage of absorbable at wavelengths other than 680nm?

Answer 16

It contains photosystems made up of primary and accessory pigments (such as chlorophyll b and carotenoids) that absorb lengths at different wavelengths (about 450-500nm) used to excite electrons in PS1 and PS2 and transfer energy to chlorophyll A

Question 17

(Figure with plant underwater)

Explain why this plant can survive in conditions other plants cannot

Answer 17

Absorbs light from shorter wavelengths as the plant is underwater and the wavelengths which penetrate the water

Absorb light which isn’t absorbed by plants above them

Question 18

Explain the relationship between heart rate and oxygen saturation using this spirometer graph

Answer 18

Chemoreceptors detect increased co2 levels which decreases 02 affinity

O2 saturation decreases due to the Bohr effect

Medulla oblongata releases noradrenaline and adrenaline from adrenal glands which increases heartbeats started by SAN

Heart rate increases and o2 saturation decreases at the same rate (maybe between 90-330)

Noradrenaline also increases breathing rate by opening airways in lungs and use data to back up

This happens to stabilise o2 conc for homeostasis

Question 19

Suggest one improvement to apparatus to safely study participants breathing during long periods of exercise

Answer 19

Reduce the intensity of the exercise to carried out over long period of time

Use a known volume of oxygen into spirometer

Question 20

Calculate the net pressure

Answer 20

-1.5kPa

Question 21

Using data from the table explain how the tissue fluid formed and how it is reabsorbed back into the blood

Answer 21

Hydrostatic pressure greater than oncotic pressure at the arteriole end. (Use net kPa from arteriole end) .This causes blood to squeeze out of the capillaries forming tissue fluid (use net kPa from data at Venule end). Oncotic pressure is greater than hydrostatic pressure so tissue fluid moves in

Question 22

Define what a tropism is

Answer 22

Directional growth in plants in response to stimuli

Question 23

State a tropism

Answer 23

Gravitropism
Phototropism

Question 24

Name another substance that can be tested in urine samples and it’s medical condition if found

Answer 24

Glucose and diabetes

Question 25

Name one abiotic stress and plant response to it

Answer 25

Antifreeze , stop cytoplasm freezing in cold temperatures

Question 26

Suggest an improvement to prevent airborne pheromones produced by the donor affecting recipient plant

Answer 26

Place containers over plants to contain airborne chemicals

Ventilation

Question 27

Control variables for beetroot PAG

Answer 27

Same age of beetroot
Same species
pH

Question 28

Graph drawing temp at 30°

Answer 28

Draw above original line, start and end at same point

Question 29

Calculate the percentage of light absorbed used for photosynthesis at 680nm

Answer 29

20-24%

Question 30

Calculate the oxygen consumption with a mass of 75kg

Answer 30

1.05 x (75/1000) = 14

Question 31

Gap fill about protein synthesis

Answer 31

RER
Golgi Apparatus
Secretory vesicles

Question 32

Calculate the rate of catalase at 30 seconds

Answer 32

3-4.2 (micro grams per second)

Question 33

Evaluate the question about sperm cells and h202 and membrane

Answer 33

Repeats
Small sample
Sampling isn’t random
Factors like age not taken into account
Error bars overlap
Statistical test
Smaller number of data sets

Question 34

Describe two measurements required to calculate the RQ value

Answer 34

Volume of o2 consumed

Volume of co2 produced

Question 35

Which respiratory substrates used throughout the graph

Answer 35

Begins 0.7 and steadily increases to peak of 0.95 indicating mix of protein and carbohydrates being respired

Question 36

Multiple choice

Answer 36

Big Bears Always Always Always Always Catch Big Ducks Baking Cakes But Always Baking Brownies