Mw Biology Lab 1

Front 1

what is the advantage to using the metric system?

Back 1

the advantage is that all conversions can be in units of ten

Front 2

standard unit of metric measure for length mass volume and tempature

Back 2

meter gram leiter and celcius

Front 3

what is the difference between a binocular dissecting microscope and a compound light microscope?

Back 3

binocular dissecting microscope is used to study 3dimentional objects at low magnification. the compound light microscope studies small or thin sections under high magnification.

Front 4

what is the difference between a transmission electron microscope and a scanning electron microscope?

Back 4

transmission electron microscope is compound lighting and the object is treated with salts or heavy metals. a scanning electron microscope is analogous to the dissecting light microscope but the object is not sliced or treated.

Front 5

resolution

Back 5

the minamum distance between 2 objects at which they can still be seen or resolved as 2 separate objects

Front 6

field of view

Back 6

the circle visible through the lens

Front 7

why is locating an object more difficult if you start with the high power objective rather than with the low power objective?

Back 7

the high power has a smaller field of view than the low power

Front 8

what function is performed by the diaphragm of a microscope?

Back 8

it controls the amount of illumination used to view the object

Front 9

how does magnification affect the field of view?

Back 9

as magnification increases the field of view decreases

Front 10

what is the difference between a longitudinal section and a cross section?

Back 10

a longitudinal section shows the cilia on the top of a cell a cross section shows the interior part of the cell where the cut was made

Front 11

what is the purpose of a control in your experiment and what does it tell you if it is positive?

Back 11

the control will go through all the steps of the experiment but it will lack the factor being tested. this allows you to observe the differnce between a positive and negitive result. if the test is positive you know it is not valid

Front 12

what is used to test for proteins?

Back 12

bivret reagent

Front 13

what is used to test for starch?

Back 13

Iodine

Front 14

what is used to test for simple sugars?

Back 14

benedicts reagent

Front 15

what are enzymes?

Back 15

protins that speed chemical reactions if you use the correct enzyme your reaction can happen much faster sometimes even in an istant

Front 16

what is the purpose of using aamylase in the starch composition experiment?

Back 16

it breaks down starch faster. it breaks down fat in the mouth & small intestine

Front 17

why is water not a good solvent for nonpolar molecules such as fats?

Back 17

water is polar an d fat is nonpolar so they wont mix together

Front 18

what is the purpose of an emulsifier?

Back 18

it will allow fat to disperse in water because if contains both polar and nonpolar molecules. when the reaction occures the fat disperses in the water resulting in emulsion

Front 19

cell theory

Back 19

all living things are composed of cells and cells only come from other cells

Front 20

plasma membrane

Back 20

regulates the movement of molecules into and out of the cytoplasm

Front 21

what are the differences between prokaruotic and eukaryotic cells?

Back 21

prokaruotic no nuclei, are bacteria, archea, dont have organals that eukaryotics have, has a nucleoid. eukaryotic contains nuclei, all other organisms have organals, has a nucleus.

Front 22

what are the diffrences between plant and animal cells?

Back 22

plant cells have a ridged cell wall a large central vacule and chloroplast. animal cells have a small vacuole and centrioles

Front 23

how would you distinguish between rough endoplasmic reticulum and smooth endoplasmic reticulum?

Back 23

rough endoplasmic reticulum is studded with ribosomes. smooth endoplasmic reticulum does not have ribosomes

Front 24

where do you find dna in prokaryotic cells?

Back 24

in a nucleoid

Front 25

where do you find dna in eukaryotic cells?

Back 25

in the nucleus

Front 26

what is the diffrence between the cell wall and the plasma membrane

Back 26

a cell wall supports shapes and protects the cell, it contains cellulose fibrils. the plasma membrane is the outer cell surgace that regulates the entrance and exit of molecules it is composed of phopholipid bilayer with embedded proteins

Front 27

what is the purpose of the mitochondria

Back 27

by breaking down sugars it makes ATP through aerobic respiration: it is the energy power house

Front 28

what is the purpose of chloroplast

Back 28

chloroplast specializes in photosynthesis

Front 29

diffussion

Back 29

movement of molecules from a higher to a lower concentration until equilibrium is achieved. once equlibrium is reached molecules may still be moving but there is no net movement, the speed is affected by tempature the size of the molecule and they type of medium

Front 30

osmosis

Back 30

diffusion of water in response to a concentration gradient

Front 31

tonicity

Back 31

relative concentration of solute and solvent outside the cell compared to the inside of the cell

Front 32

what is the purpose of the dialysis membrane in the experiment?

Back 32

the dialysis membrane simulates a plasma membrane. this experment shows how some molecules can diffuse across the plasma membrane and some cant

Front 33

turgor pressure

Back 33

the large central vacuole gains water and exerts pressure on the cell wall

Front 34

plasmoloysis

Back 34

central vacuole loses water and the cyotplasm including the chloroplasts pull away from the cell wall

Front 35

how do red blood cells look in distilled water. why?

Back 35

turgor pressure causes the cells to baloon up. hypotonic when compared to saline

Front 36

how do red blood cells look in -.9% saline and why

Back 36

it stays the ame because thy are both isotonic

Front 37

how do red blood cells look in -10% saline

Back 37

shrivled because of mixing a 10%hypertonic solution and a hyporrsec solution

Front 38

why dont plantcells burst when placed in hypotonic solutions

Back 38

the rigid cellwalls act like a box making it more difficult for the cell to burst

Front 39

if a dialysis bag is filled with water and placed in molasses what will happen to the weight of the bag and why

Back 39

the bag will get lighter because the water leave the bag through plasmolysis because the water leavs the bag it shrivles and gets lighter

Front 40

what reaction is studied in the enzyme lab?

Back 40

2H₂O₂ →2H₂O+O₂

Front 41

what is the purpous of the catalase?

Back 41

it speeds up the reaction because it breaks down hydrogen peroxide making it 2H₂O+O₂

Front 42

what is being measured in the enzyme lab?

Back 42

the gas volume. O₂

Front 43

what is the purpose of the controls used in the enzyme lab?

Back 43

the first is distilled water, it is used to compare acid base. the secconed is nondistilled water and it compares everything else.

Front 44

what would you expect to happen if you increased the temperature by a reaction of 10degreese?

Back 44

double the reaction time by speeding it up

Front 45

what would happen if you applied to much heat and why?

Back 45

it would change the shape of the proteines denatureing the catalase

Front 46

whet would you expect if you decreased the temperature by 10degreese?

Back 46

reduce the reaction by half/slow it down

Front 47

if the pHof an experiment is adjusted how can you determin if it is correct for the enzyme?

Back 47

the correct pH will have the fastest reaction time

Front 48

why does the volume of gas need to be corrected?

Back 48

because exactly 1oz was not used in each case sot you need to correct the measure ments by deviding each gas volume by the actual mass of the ...

Front 49

what is the equation for photosynthesis?

Back 49

CO₂+H₂O→(CH₂O)underscore n + O₂

Front 50

where does photosynthesis take place?

Back 50

in the chloroplast

Front 51

when preforming the experimental procedure with white light why does the level of the solution change (move foward then recede)

Back 51

makes oxygen which exerts presusre on the water pusing more water through the tube attached to the top of the test tube. it recedes because of aerobic resporation.

Front 52

why does the rate of photosynthesis decrese when you preform the experimental procedure with green light?

Back 52

because chloraphil is the predomanant pigmant and it cannot use green light.

Front 53

why doesnt photosynthisis stop completely when using green light?

Back 53

because there are othere pigments theat can use green light to preform photosynthisis

Front 54

why might diffrent groups get diffrent results?

Back 54

diffrent rates, diffrent colors of green light, diffrent placement of light in relation to testtube.

Front 55

phenol red a pH indicator turns yello indicating acid when you brethe into a solution. how does the reaction explain why the solution turned acidic?

Back 55

when you breathed in you added more CO₂which caused more hydrogen to form.

Front 56

phenol red turns back to red when a plant in light is added to the solution. why?

Back 56

becuase the plant causes the CO₂+H₂O→H₂CO₃→Hpositive +HCO₃to reverse which removes to extra hydrogen.