Biology 115 Test 3 Homework Questions

Front 1

what is cancer caused by

Back 1

carcinogens

Front 2

estrogen testosterone smoking viruses UV light and fat are all considered what

Back 2

carcinogens

Front 3

a diet high fat promotes which cancers

Back 3

colon, rectum and breast cancer

Front 4

a diet high in fat may also induce or speed up which cancer

Back 4

prostate

Front 5

which hormone is related to prostate cancer

Back 5

testosterone

Front 6

what influences a woman's chance for breast cancer which hormone produced over what span

Back 6

the amount of estrogen she produces over her lifetime

Front 7

when does estrogen levels rise

Back 7

when a woman ovulates

Front 8

what causes cells in her breasts to divide

Back 8

ovulation due to rise in estrogen

Front 9

why would estrogen levels remain high during a womans life

Back 9

early menstruation or late menopause

Front 10

what increases a chance in a mutation

Back 10

cell division-hence if a woman is constantly dividing the cells in her breast due to early or late menstruation/ menopause she will have an increased chance of developing breast cancer

Front 11

what carcinogens cause lymphomas

Back 11

viruses

Front 12

where is taxol extractic from

Back 12

pacific yew tree

Front 13

what does taxol and vinblastine specifically affect

Back 13

formation of the mitotic spindle

Front 14

vinblastine is what

Back 14

a chemotherapeutic drug

Front 15

what does vinblastine affect

Back 15

the assembly of micro tubules

Front 16

One difference between cancer cells and normal cells is that cancer cells

Back 16

continue to divide even when they are tightly packed together.

Front 17

What is true of all cancers?

Back 17

They have escaped normal cell cycle controls.

Front 18

How do cancer cells differ from normal cells?

Back 18

Cancer cells may be immortal.

Front 19

HeLa cells are examples of what characteristic of cancer cells

Back 19

their immortality

Front 20

The cell cycle control systems of cancer cells differ from those of normal cells. Select the best explanation for this fact.

Back 20

Genetic changes alter the function of the cancer cell’s protein products

Front 21

in order from top to bottom name the components of a phopholipid

Back 21

choline
phosphate
glyceral
fatty acid chains

Front 22

what is the head of a phospholipid comprised of

Back 22

choline, phosphate and glycerol

Front 23

the phosphate group on a phopholipid is what charge

Back 23

polar

Front 24

the fatty acid chain is what charge

Back 24

nonpolar

Front 25

which type of molecules are hydrophobic

Back 25

nonpolar molecules (O2 CO2 hydrocarbons)

Front 26

which type of molecules can is hydrophilic

Back 26

polar molecules and ions

Front 27

which molecules need a transport membrane

Back 27

polar molecules and ions

Front 28

what is passive transport

Back 28

transport accross the membrane without any work expended

Front 29

when something is passively transported, how does their gradient go

Back 29

it goes down the concentration gradient

Front 30

facilitated diffusion is a form of what type of transport

Back 30

passive

Front 31

does facilitated diffusion require the cell to expend any energy

Back 31

no

Front 32

how does water cross the plasma membrane

Back 32

facilitated diffusion

Front 33

what is water crossing the membrane called

Back 33

osmosis

Front 34

the sodium potassium pump moves molecules how (gradiant)

Back 34

against their concentration gradient

Front 35

what is the sodium potassium pump considered what type of transport

Back 35

active transport

Front 36

what is used to move sodium ions out of the cell

Back 36

ATP

Front 37

sodium potassium pump moves how what goes out what goes in

Back 37

sodium goes out potassium goes in

Front 38

what type of action is the cotransport pump

Back 38

active tranport

Front 39

what goes into and out of the cell in a cotransport

Back 39

both sodium and glucose move into the cell

Front 40

the sodium in the cotransport pump moves with what gradient

Back 40

down the concentration gradient created by the sodium potassium pump

Front 41

how does glucose move in a cotransport pump

Back 41

against the concentration gradient

Front 42

what exports materials from the cell

Back 42

through vesicles

Front 43

what is the exportation of materials by vesicles called

Back 43

exocytosis

Front 44

what happens during endocytosis

Back 44

the plasma membrane gets pinched forms a vesicle with the materials from outside of the cell into the cell

Front 45

molecules diffusing move how with each other

Back 45

independently

Front 46

when do concentration gradients exist that drive diffision

Back 46

only before equilibrium

Front 47

when there is no net movement in diffusion what happens

Back 47

object is at equilibrium

Front 48

which molecules can cross the lipid membrane without a transport protein or mechanism 4

Back 48

carbon dioxide
oxygen
water
lipids

Front 49

what type of molecules can pass readily through the lipid layer

Back 49

small non polar like dissolved gasses o2 co2 n2

Front 50

two types of transfer proteins

Back 50

channels and carrier

Front 51

channels provide what kind of path

Back 51

continuous

Front 52

what molecules use channels

Back 52

water and small ions

Front 53

what do carriers transport

Back 53

small polar organic molecules

Front 54

which undergoes a change in shape to transport solutes across the membrane

Back 54

carriers

Front 55

what type of path do both channel and carrier proteins provide

Back 55

hydrophilic

Front 56

what type of member proetin are channel and carrier

Back 56

integral

Front 57

channels and carriers do what with a gradiat

Back 57

transport down the concentraion gradient