Both papers of biology Flashcards

Question

Describe how each factor affects enzyme activity

Answer 1

Temperature can change the rate of the reaction as it heats up it will reach the optimised temperature however if it is higher then that the enzyme will denatured this is the same with pH. However with substrate concentration the reaction will be much faster until there's too much and the active site will all be full and adding more substrates will not make a diffference

Answer 2

Rate=1000÷time

Answer 3

1) Put a drop of iodine into every well of a spotting tile. 2) Bunsen burner on top of heat-proof mat and a tripod and gauze over the bunsen burner. Pit beaker of water(35°C) over tripod, keep temp constant. 3) Use syringe to add 3cm3 of amylase solution and 1cm3 of buffer solution with a pH of 5 to a boiling tube. Using test tube holders put it into the beaker of water and wait for 5 minutes. 4)use diff syringe to add 3cm3 of starch solution to the boiling tube. 5)mix contents if the boiling tube and start a stop clock. 6)use continuous sampling to see how long the amylase breaks down the starch to do this use a dropping pipette to take a fresh sample from the tube every 10 seconds and put a dtop onto a well. When the uosine solution is browned orange starch is no longer present. 7) Repeat with different pH levels to see olhpw pH effects the time taken for starch also to be broken 8)Remember to control the variable each time to make it a fair test

Answer 4

Diffusion is the net movement of particles from an area of higher concentration to a lower concentration.

Answer 5

Active transport is the movement of particles across a membrane against a concentration gradient using energy transferred during respiration.

Answer 6

Osmosis is the net movement of water molecules across a partially permeable membrane from a region higher water concentration to a region of lower concentration.

Answer 7

If a cell is placed in a hypertonic solution, water will leave the cell, and the cell will shrink. In an isotonic environment, there is no net water movement, so there is no change in the size of the cell. When a cell is placed in a hypotonic environment, water will enter the cell, and the cell will swell

Answer 8

% change = final mass - initial mass ÷ initial mass x100

Answer 9

1) Prepare sucrose solutions of different concentrations ranging from pure water to a very concentrated sucrose solution. 2) Use a cork borer to cut a potato into the same sized pieces (The pieces need to be about 1cm in diameter and preferably from the same potato.) 3) Divide the cylinders into groups of three and use mass balance to measure the mass of each group. 4) Place one group In each solution. 5) Leave the cylinders in the solution for at least 40 minutes (making sure that they all get the same amount of time). 6)Remove the cylinders and pat dry gently with a paper towel. This removes excess water from the surface of the cylinders, so you get a more accurate measurement of their final masses. 7 ) Weigh each group again and record your results. 8 ) The only thing that you should change in this experiment is the sucrose solution concentration. Everything else (e.g. the volume of solution, the size of the potato cylinders, the type of potatoes used, the amount of drying, etc.) must be kept the same or your results won't be val'd.

Answer 10

To move substances along in 1 direction. In the air way it moves mucus and particles from the air up the throat so it can be swallowed and doesn't teach the lungs.

Answer 11

Carry female DNA and to nourish the embryo

Answer 12

Is to transport Male DNA to egg cell.

Both papers of biology Flashcards

(39 cards)