Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Biology > Biological molecules > Flashcards

Biological molecules Flashcards

You may prefer our related Brainscape-certified flashcards:
AP® Biology flashcards Biology 101 flashcards
1
Q

how many elements do carbs have?

A

3 carbon, hydrogen and oxygen

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

general formula for carbohydrate?

A

Cx(H2O)y

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

what ae carbohydrates?

A

they are macromolecules

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

some carbs are polymers what are these?

A

they are made of monomers joined in polymerisation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

what are the different types of polymers?

A

Monosaccharide - monomers of carbs
disaccharide - two monosaccharides
polysaccharide - many monosaccharides

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

what is the formula for monosaccharides?

A

(CH2O)n n= 3—7

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

characteristics of monosaccharides?

A

they are sweet and soluble in water

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

when n = 3 what occurs?

A

C3H6O3 — Triose

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

when n=6 what happens?

A

C6H12O6 — hexose

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

what do all monosaccharides end in?

A

ose

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

formula for alpha and beta glucose ring structure?

A

OH! ABBA

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

what does glucose form?

A

2 isomers alpha and beta same chemical formula different structures

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

what are 2 roles of these isomers?

A

source of energy for respiration - C-H bonds release energy when broken and they are important for building large molecules, glucose makes starch and deoxyribose

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

how are disaccharides formed?

A

when 2 monosaccharide join in condensation reaction H2O is released bond between monomers is glycosidic bond.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

disaccharide maltose from 2 alpha glucose.

A

OH groups involved in condensation reaction, hydrolysis addition of H2O, C bonds join to O with 1-4 glycosidc bond H2O is released

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

what are the rules for these reactions?

A

circle groups involved
show water is released
circle + label bond formed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

where are glycoproteins found?

A

in external layers of bilayer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

what are glycoproteins for?

A

receptor sites on hormones + transmitters also for intercellular lubrication

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

what are polysaccharides?

A

polymers made of many monosaccharides joined in condensation reaction linked by glycosidic bond

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

where is the polysaccharide starch found and what monomer is used?

A

plants and alpha glucose

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

where is polysaccharide glycogen used and what monomer is used?

A

animal and fungi alpha glucose is used

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

where is polysaccharide cellulose found and what monomer is used?

A

plants and beta glucose

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

what do many plants use polysaccharides as?

A

as an energy store as its insoluble and doesn’t affect water potential unlike glucose

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

what is the main role of starch in plants?

A

used as an energy store , stored as granules in chloroplasts starch is 20% amylose and 80% amylopectin

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

what is the primary structure?

A

the order and sequence of amino acids in polypeptide chain, this is responsible for the final 3D shape, changing one amino acid may alter shape and therefore function

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

what is secondary structure?

A

this is how polypeptide chain begins to fold, can fold to form alpha helix or beta pleated, both held by H bonds. these can be broken by high heat and pH changes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

what happens in alpha helix?

A

H bonds between amino acids 4 residules apart, it forms between carboxylic acid and amine group 4 molecules away.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

what happens in beta pleated?

A

polypeptide chain folded into a structure with parallel amino acids held by H bonds

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

what is the tertiary structure?

A

how the secondary structure presen in the polypepide chain fold to produce 3D shape, shape is held by 4 bonds.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

what are the 4 types of bond?

A

Hydrogen bonds
Ionic bonds
disulphide bonds
hydrophobic interactions

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
31
Q

where do hydrogen bonds occur?

A

between R groups of amino acids or carboxylic of one and amine of then other broken by high temps or pH changes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
32
Q

where do ionic bonds occur?

A

between oppositely charged R groups these can be broken by pH changes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
33
Q

where do disulphide bonds occur?

A

between R groups of different cysteine amino acids these can be broken by reducing agents

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
34
Q

where do hydrophobic interactions occur?

A

between hydrophobic R groups of different amino acids they come close together away from water

35
Q

what is quaternary structure?

A

two or more polypeptide chains held by H bonds, ionic, disulphide and hydrophobic interactions

36
Q

what is haemoglobin?

A

globular protein with 4 polypeptide chains two alpha chains and two beta chains held by H bonds.

37
Q

what does each chain contain?

A

a haem group containing iron ion

38
Q

what is the haem group known as?

A

the prosthetic group as it is not made by amino acids

39
Q

what can bond with the iron?

A

one oxygen molecule can reversibly bond

40
Q

what can each haemoglobin carry?

A

4 oxygen molecule

41
Q

how does the chain fold?

A

amino acids with hydrophilic r groups arrange themselves on the outside and hydrophobic amino acids arrange on inside to maintain the shape

42
Q

what is collagen?

A

it is a fibrous protein with quaternary structure it has 3 helical polypeptide chains arranged in triple helix held by H bonds. they are closely packed due to every 3rd amino acid being glycine, the smallest Amino acid R group just H atom

43
Q

how do collagens bond to each other?

A

using covalent bonds

44
Q

how do collagen fibrils form?

A

covalent bonds are staggered increasing tensile strength, lots of collagen fibrils together form fibres

45
Q

what are lipids?

A

diverse group of chemicals

46
Q

what is the most common lipid?

A

triglycerides found in Fats and Oils.

47
Q

what is triglyceride made of?

A

iglycerol and 3 fatty acids joined in condensation reactions linked by ester bonds

48
Q

3 roles of triglycerides?

A

source of energy- respired to release ATP
energy storage - can be stored in indipose cells
all biological membranes are made of lipids

49
Q

characteristics of amylose?

A

200-5000 alpha glucose per molecule
unbranched helical chain
1-4 glycosidic bonds
when coloured with iodine it is deep blue

50
Q

characteristics of amylopectin?

A 
5000 - 100000 glucose per molecule
branched chain
1-4 glycosidic bonds on chain
1-6 glycosidic bonds between branches
red/purple when coloured with iodine
51
Q

what is role of glycogen?

A

main role in animals is store- stored as granules in muscle and liver.

52
Q

characterisitcs of glycogen?

A

1-4 glycosidic bonds between monomers

1-6 between branches similar to amylopectin however shorter branches

53
Q

role of cellulose?

A

to provide structural support it is made of beta glucose joined by 1-4 glycosidic bonds

54
Q

why must beta glucose be rotated 180 degrees?

A

because OH group is above the ring on C1.

55
Q

what does beta glucose form?

A

straight unbranched parallel chains

56
Q

how are these parallel chains linked?

A

cross linked by H bonds making the structure strong 60 - 70 linked known as microfibrils

57
Q

what are bundles of microfibrils known as ?

A

cellulose fibrils they are linked by H bonds

58
Q

where is cellulose found??

A

in the plant cell wall providing strength makes up 20 - 40 %

59
Q

features of cellulose?

A

it is fully permeable and high tensile strength this prevents the cell bursting during osmosis

60
Q

what are proteins?

A

they are macromolecules made of amino acids (monomers) make more than 50% of the dry cell mass

61
Q

what are elements found in proteins?

A 
carbon
sulphur
hydrogen
oxygen
nitrogen
62
Q

what are functions of proteins?

A

component of plasma membrane
enzymes control cellular reaction
haemoglobin proteins found in blood cell transports O2

63
Q

how many types of amino acids are there?

A

20 types 8 are essential. they all have the same general structure vary by chemical elements found in the R group.

64
Q

what do amino acids have?

A

structure shown as amine group on left two C and N in central branch, R group above central C carbocylic acid on the second C, OH below.

65
Q

what are dipeptides?

A

two amino acids joined in condensation reaction using peptide bond

66
Q

how do two amino acids join?

A

carboxylic acid of one and amine of the other join in condensation reaction (hydrolysis) forming molecule plus water. joined using peptide bond.

67
Q

how can amino acids be linked?

A

by peptide bonds to form polypeptides.

68
Q

how many polypeptide chains are in collagen and haemoglobin?

A

collagen has 3

haemoglobin has 4

69
Q

why must polypeptide chains be folded?

A

to create specific 3D shape to allow them to carry out a specific funsction

70
Q

what is a phospholipid?

A

special type of lipid found in cell membrane, fatty acid tail is replaced by phosphate group.

71
Q

features of phospholipid?

A

head is hydrophilic

tail is hydrophobic

72
Q

roles of phospholipids?

A

major component of plasma membrane form a bi layer in water, they are responsible for partially permeable allow lipid soluble substances to enter and leave the cell.

73
Q

what does P.A.W.S stand for?

A

polar are water soluble

74
Q

how many regions does cholesterol have?

A

Hydrocarbon tail at bottom
then ring structures in middle
and hydroxyl group at the top

75
Q

what is polar?

A

hydroxyl group is polar - hydrophilic

76
Q

what is non polar?

A

ring structure and hydrocarbon tail - hydrophobic - lipid soluble

77
Q

why is cholesterol described as amphipathic molecule?

A

has water soluble and fat soluble regions

78
Q

what ios role of cholesterol?

A

as part of cell membrane regulates fluidity (less fluid at high temp) reduces side to side phospholipid movement they increase cell mechanical stability also prevent water and dissolved ion leakage

79
Q

what is the reducing sugar test?

A

you add benedicts reagent and then heat the solution a positive result will give brick red result

80
Q

what is starch test?

A

you add iodine which contains iodine dissolved I potassium iodide, a positive result is a blue black result

81
Q

what is the lipid test?

A

you add ethanol to the sample and shake, then poor liquid into water, result is emulsion result

82
Q

what is protein test?

A

add biurets to a sample which contains potassium hydroxide copper -2- sulphate and heat. a positive result is purple colour

83
Q

what is non reducing sugars test?

A

same as reducing if a negative result use benedicts test add HCL heat it and then neutralise with sodium hydrocarbonate. add benedicts and heat. positive is a brick red result

Biology (9 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions