Figure 11 shows the results
time taken for amylase to produce glucose (s)
Test 4
120
125
110
115
Figure 11
() Calculate the rate of amylase enzyme activity for the 10% starch solution.
Answer:
Phenolphthalein is an indicator. It is pink in alkaline solutions and turns colourless as the pH decreases.
It can be used to measure the activity of the enzyme lipase on the breakdown of lipids.
Samples of milk containing phenolphthalein were incubated with lipase at different temperatures.
The time taken for the phenolphthalein to turn colourless was recorded and used to calculate the rate of enzyme activity.
Figure 10 shows these results.
Picture
(a) (i) Explain why phenolphthalein turns colourless when lipase breaks down the lipids in milk. (2)
(ii) Describe the effect of temperature on the activity of lipase, as shown in Figure 10. (2)
(iii) Explain why the activity of lipase changes above a temperature of 40°C. (2)
(b) A student investigated the time taken for amylase to breakdown a 10% starch solution into glucose at 37°C. The student repeated the investigation five times.
To calculate the rate of amylase enzyme activity for the 10% starch solution, divide the time taken for amylase to produce glucose by the total time elapsed. For each test, this rate can be expressed as the number of glucose molecules produced per unit of time.
The rate of amylase enzyme activity for the 10% starch solution can be calculated by determining the time taken for amylase to produce glucose. In this investigation, the time taken for amylase to break down the starch solution into glucose was recorded in seconds. To find the rate, divide the amount of glucose produced (in this case, the time taken) by the total time elapsed. For example, for Test 4, the time taken was 120 seconds. The rate of amylase enzyme activity can then be expressed as 1 glucose molecule produced per 120 seconds.
#SPJ3
Answer:Hello,
Neon is a noble gas. It is located Group 18 and the oxidation number is 10.
I hoped it helped have a nice day!
A) markings on the gun's exterior
B) markings on the casing
C) markings on the bullet
D) powder residues
One that is can associate a suspect and the firing of a gun is powder residues. The correct option is D.
GSR is made up of unburned or partially burned gunpowder particles, soot, nitrates, and nitrites from powder combustion, primer particles (oxides of lead, antimony, and barium), and bullet or bullet jacket particles that are vaporized when a firearm is discharged.
Gunshotresidue (GSR) is a speck of vital trace evidence that assists forensic scientists in solving a wide range of firearm-related incidents.
The identification of the shooter, as well as bullet identification from a gunshot wound, aid in the reconstruction of a crime scene.
Powderresidues are one thing that can link a suspect to a gunshot.
Thus, the correct option is D.
For more details regarding gun powder, visit:
#SPJ5
FALSE
Answer:
True
Explanation:
The boiling point of a liquid is the temperature at which the vapour pressure of the liquid equals the pressure of the surrounding atmosphere.
When a liquid is heated, the vapour pressure gradually increases till it matches the ambient pressure. Gas bubbles begin to form within the liquid, rise to the surface and then burst up to release gas. At this point, we say the liquid is boiling.
The lower the surrounding pressure, the lower the boiling point of a liquid and vice versa. Water boils at lower temperature in high altitudes because of lower pressure as compared to sea level.
Correct option: True.
Natural systems like water in a pond rarely reach thermal equilibrium due to temperature differences and energy transfer limitations.
Natural systems like the water in a pond rarely reach thermal equilibrium due to various factors.
These factors prevent the pond from reaching thermal equilibrium.
#SPJ1
Answer:
B. adding a hydroxyl group C. adding a carboxyl group
Explanation:
Solubility in water is due to the polar interactions or the hydrogen bonding.
Methyl group and benzene ring are both polar and hydrophobic in nature and thus will not improve water solubility.
Increasing size of drug will make more insoluble as more size of the solute is being added.
Adding hydroxyl or carboxyl group can improve water solubility as both the groups are highly hydrophilic and polar. These groups can form hydrogen bond with the water molecules and make drug more soluble in the water.