biology exam 2

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148 Terms

1

oxidation

loses electrons

(LEO)

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2

reduction

gains electrons

(GER)

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3

NAD+ → NADH

reduction

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4

electron transport chain

electrons are harvested from NADH and FADH2 through oxidation, electrons are shuttled down a series of transmembrane proteins, final electron acceptor is OXYGEN (which is reduced to make H2O)

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5

chemiosmosis

when a proton gradient is used to drive energy-requiring processes, starting with one glucose molecule, 34 atp are generated

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6

how do prokaryotes make ATP if they don’t have mitochondria

fermentation

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7

true or false: both eukaryotic and prokaryotic cells can use fermentation

true

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8

fermentation is a ___ process

anaerobic (no O2 required)

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9

how much does ATP does fermentation make

a little

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10

fermentation is used by which type of muscles

“fast twitch fiber” muscles, used for short energy bursts (sprinting/lifting weights, etc)

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11

where does fermentation occur

the cytoplasm (no organelle required)

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12

anaerobic fermentation pros and cons

con: very little ATP is made

pro: occurs in complete absence of oxygen, some ATP is better than none, replenishes glycolysis

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13

two types of fermentation

  1. lactic acid

  2. alcoholic

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14

lactic acid fermentation is mostly used by

eukaryotes (muscle cells)

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15

lactic acid steps

  1. glycolysis: same process as cellular respiration (2 net ATP)

  2. pyruvate processing: pyruvate is converted to lactate (lactic acid), the cause of the “burn” in muscles

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16

how does the kinase (enzyme) make ATP?

transfers a phosphate group from a substrate to ADP

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17

which cell types use alcoholic fermentation?

  1. yeast (eukaryotic)

  2. bacteria

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18

ethanol

an alcohol, rich in energy, but often toxic to eukaryotic cells in high doses

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19

alcoholic fermentation converts pyruvate to

pyruvate → acetylaldehyde → ethanol

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20

what product of alcoholic fermentation can be used to keep glycolysis going?

NAD+

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21

what are the products at the end of the anaerobic cycle

  1. 2 ethanol OR 2 lactate

  2. 2 ATP

  3. 2 NAD+ (which can be reused in glycolysis)

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22

what are the oxygen-dependent processes?

electron transport chain & chemiosmosis

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23

why is fermentation the emergency backup plan?

NADH and FADH2 can donate electrons to pyruvate molecules (NADH becomes are input for fermentation and pyruvate gets reduced)

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24

true or false: anaerobic respiration always produced less ATP than aerobic respiration

true

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25

true or false: only prokaryotes use fermentation

false

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26

during fermentation, what molecule is produced that is able to initiate glycolysis again?

FAD and NAD+

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27

autotroph

use light to make food by themselves

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28

plant food

sugars (mainly glucose)

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29

what is photosynthesis

food producing process for plants (sugars)

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30

what does photosynthesis do

convert energy carried by photons into chemical bond energy

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photosynthesis inputs and outputs

inputs: CO2, H2O, light

outputs: O2, sugars (storable energy)

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heterotrophs

eat external food for energy

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stack of thylakoids

granum

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34

thylakoids contain __ used for photosynthesis

photopigments

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35

photopigments

molecules that undergo chemical change when they absorb photons (light)

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where are photopigments found?

thylakoid membrane

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photopigments resemble a…

lipid (polar head and hydrocarbon tail)

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main photopigment

chlorophyll a

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39

accessory pigments

chlorophyll b, carotenoids

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40

carotenoids are responsible for what

seasonal changes (leaves green → orange/red)

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41

absorption

photons are completely absorbed (color you DON’T see)

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42

reflected

photons are reflected (color you DO see)

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transmission

photons pass directly through

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44

light has two categories

visible light and other light

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45

wavelength

distance between photon waves

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46

light from shortest to longest wavelength

gamma rays, x-rays, ultra-violent, visible light, micro-waves, radio waves

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47

the shortest wavelength has the __ energy

highest

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48

shorter wavelengths

can damage cells & cause mutations

(think gamma rays creating the hulk)

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49

chlorophyll a & b

absorbs blues and reds, reflects greens

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tenoidscar

absorbs all but oranges/reds, reflects oranges/reds

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51

if a leaf is green,

green light is reflected

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52

when a photon is absorbed

carried electrons enter an excited state

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why would blue light provide the most excitation?

it has the shortest wavelength and therefore the highest energy

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54

true or false: red and orange wavelengths of visible light have higher energy that blue and greens

false

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55

stages of photosynthesis

  1. light dependent reactions

  2. light independent reactions (calvin cycle)

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light dependent reactions steps

  1. photosystem 2

  2. photosystem 1

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photosystem 2

a group of photopigments within the thylakoid membranes

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photosystem 2 steps

electrons are excited, then donated to a protein called PEA, then an electron transport chain occurs

H2O required, O2 is a waste product

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59

ATP production via movement of protons across a membrane is called

chemiosmosis

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60

electron transport chain

H+ protons diffuse through ATP synthetase

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photosystem 1

electrons harvested from photosystem 2 are donated to neighboring photosystem 1

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major difference between photosystem 1 and 2

photosystem 1 is where NADPH is produced

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light independent reactions function

sustains plant life during periods of darkness (night), designed to slowly produce food to ensure survival

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what products of the calvin cycle refuel the light dependent reactions

NADP+ and ADP

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65

three stages of calvin cycle

  1. carbon fixation

  2. reverse glycolysis

  3. replenishment of RuBP

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66

carbon fixation

carbon from atmospheric CO2 is “fixed” onto RuBP (an enzyme) forming PGA

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detailed carbon fixation

1 carbon from CO2 fixes onto RuBP - making it 6 carbons long

6 carbon RuBP splits in half (2 sets of 3 carbon)

creates 2 PGA per 1 RuBP (6 PGA made in total bc it starts with 3 RuBP)

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reverse glycolysis

6 PGA’s from carbon fixation are reduced to produce 6 G3Ps

outputs: glucose (food), G3P (used to replenish RuBP for carbon fixation)

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why is it called reverse glycolysis?

because in glycolysis we break down sugar, but in reverse glycolysis we are making sugar

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70

replenishment of RuBP

G3P produced in reverse glycolysis creates more RuBP for carbon fixation

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71

if you place a plant in a room with no light, the first system to be affected is the

LDRs

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72

if you deprive a plant of all CO2, the system that will be affected first is

the calvin cycle

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73

where is the specific location where sugars are produced?

stroma

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74

what are the similarities between cellular respiration and photosynthesis?

chemiosmosis, electron transport chain, ATP production, electron carrier production

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75

proliferation

how cells are “born”

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76

apoptosis

cell death

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interphase steps

  1. G1

  2. S

  3. G2

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78

G1

cell growth

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S

synthesis of DNA (making a copy and condensing it)

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80

G2

more growth, centrosomes form (move to opposite poles)

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homologous chromosomes

identical chromosomes from each parents

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82

human karyotype

46 chromosomes, 23 pairs

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83

diploid (2n)

two copies of all genes (from each parent)

2n = 46 chromosomes

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84

diploid examples

non-sex cells (skin cells, kidney cells, brain cells, etc)

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85

haploid (n)

one copy of genes

n = 23 chromosomes

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86

haploid examples

sex cells / gametes (sperm and egg)

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sister chromatids

chromosomes after they’ve been replicated, same information on each chromatid

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centromere

where sister chromatids are held together

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89

dna levels range from 3 to 6 picograms per nucleus, at which stage of the cell life cycle would you predict a cell to have 6 picograms?

G2

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90

mitosis

production of two identical progeny cells from a single parent cell (cell division of non-gamete cells in eukaryotes)

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91

major roles of mitosis

organismal growth, development, tissue renewal & repair, reproduction

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92

__ are separated through mitosis

sister chromatids

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93

genome

the complete set of genes or genetic material present in a cell or organism

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stages of mitosis

(interphase)

  1. prophase

  2. prometaphase

  3. metaphase

  4. anaphase

  5. telophase/cytokinesis

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95

prophase

chromosomes begin condensing, spindle fibers emerge from centrosomes

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96

spindle fibers

cytoskeletal molecules that will attach to chromosomes at the centromere pull chromosomes apart

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prometaphase

nucleus membrane dissolves (allows us to have access to chromosomes), centromeres arrive at cell poles

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98

metaphase

chromosomes line up at the metaphase plate

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99

anaphase

sister chromatids pulled apart by spindle fibers

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telophase and cytokinesis

DNA begins to decondense, cell divides, nucleus membrane reforms (1 cell → 2 cells)

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