// Topic 1 PART 2 Flashcards
figure 7 shows a cyanobacterium magnified 50 000 time. line AB shows diameter of bacterial cell
calculate the actual diameter of the cyanobacterium in micrometers (pm)
6.5cm x 10 000 = 65 000
65 000 / 50 000 = 1.3pm
bacteria cells contain plasmids.
describe three other features of a bacterial cell
a bacteria cell has no nucleus but has a cell wall and a flagellum
lactase is an enzyme that breaks down lactose into glucose and galactose. student made some alginate beads containing lactase results shown in figure 10 of how long it took to produce glucose.
what is the rate of reaction for 25 beads? A) 0.008s-1 B) 0.04s-1 C) 0.21s-1 D) 4.8s-1
A) 0.008s-1
lactase is an enzyme that breaks down lactose into glucose and galactose. student made some alginate beads containing lactase results shown in figure 10 of how long it took to produce glucose.
explain the conclusion that can be made from these results
increasing the lactase increases the rate of reaction. more beads increases the concentration of enzyme so there is an increase chance of collisions
lactase is an enzyme that breaks down lactose into glucose and galactose. student made some alginate beads containing lactase results shown in figure 10 of how long it took to produce glucose.
explain why the same volume of lactose solution was used for each test
lactose is the substrate and it is a controlled variable
lactase is an enzyme that breaks down lactose into glucose and galactose. student made some alginate beads containing lactase results shown in figure 10 of how long it took to produce glucose.
devise a method to find the optimum temperature for the enzyme lactase
mix equal numbers of lactase with equal volume of lactose and incubate the tubes at different temperatures. test for the presence of glucose at regular intervals
figure 3 is a drawing of a eukaryotic cell. structure Z is found in plant leaf cells
name structure Z
chloroplast
give one function of mitochondrion
aerobic respiration
describe how a prokaryotic cell is different from the cell in figure 3
no nucleus and no mitochondria
student mixed starch solution with amylase and kept the tube in a water bath testing the solution for starch and glucose every 30 seconds results shown in figure 6
give one reason for the result at 150 seconds
all starch has been converted to glucose
student mixed starch solution with amylase and kept the tube in a water bath testing the solution for starch and glucose every 30 seconds results shown in figure 6.
another student repeated the investigation with the same volumes of solutions at same temp.
give two other variables that would need to be controlled in the investigation
- pH of the solution
2. size of the tube used
student mixed starch solution with amylase and kept the tube in a water bath testing the solution for starch and glucose every 30 seconds results shown in figure 6
both students also included with distilled water instead
give one reason why this tube was included in their investigation
to check that starch doesn’t break down into glucose without amylase
amylase has an optimum ph of 6.8
devise a method the students could use to confirm the optimum pH of amylase
mix starch solution with amylase and use different pH values. using buffers test at pH solutions between 6.5 and 7.5
amylase is produced by salivary glands and the pancreas.
explain why amylase isn’t produced in the stomach
the stomach is acidic which will denature the amylase. this changes the shape of the active site so substrate wont bind
a scientist investigated how the length of starch grains in potatoes changed when the potatoes were stored in the dark shown in figure 5. figure 6 shows results
state two variables the scientist should have controlled to improve this investigation
- mass of potato
2. temperature
a scientist investigated how the length of starch grains in potatoes changed when the potatoes were stored in the dark shown in figure 5. figure 6 shows results
describe how starch is broken down into glucose
starch fits into the active site and the bonds between glucose molecules in starch are broken
a person with a kidney disease may need kidney dialysis treatment figure 15 showing an experiment to show how a dialysis membrane works
describe how the method that would be used to find out what is present in the solution in the beaker, after one hour
use benedicts solution to test for glucose. add it to the solution and heat, if glucose is present it turns brick red. use iodine to test for starch. add it to the solution and if starch is present it turns blue/black
a person with a kidney disease may need kidney dialysis treatment figure 15 showing an experiment to show how a dialysis membrane works
explain how this experiment represents a simple model of a kidney dialysis treatment
the dialysis membrane acts as a cell membrane as it shows small molecules and glucose moving through the membrane
